浴野 稔一Toshikazu Ekino

Last Updated :2019/12/02

所属・職名
大学院総合科学研究科環境自然科学講座教授
ホームページ
メールアドレス
ekinohiroshima-u.ac.jp

基本情報

学位

  • 理学博士(青山学院大学)
  • 理学修士(青山学院大学)

教育担当

  • 【学士課程】 総合科学部 : 総合科学科
  • 【博士課程前期】 総合科学研究科 : 総合科学専攻
  • 【博士課程後期】 総合科学研究科 : 総合科学専攻

担当主専攻プログラム

  • 総合科学プログラム

研究分野

  • 数物系科学 / 物理学 / 物性Ⅱ

研究キーワード

  • 超伝導
  • ナノスケール物理学
  • エネルギーギャップ
  • ブレークジャンクション
  • 走査トンネル顕微鏡・分光
  • トンネル現象
  • 高温超伝導電子状態
  • 鉄系高温超伝導
  • f電子系物質の物性

教育活動

授業担当

  1. 2019年, 教養教育, 1ターム, 物理学実験法・同実験I[2理物]
  2. 2019年, 教養教育, 2ターム, 物理学実験法・同実験II[2理物]
  3. 2019年, 教養教育, 3ターム, 基礎物理学I[1歯歯,1歯工]
  4. 2019年, 教養教育, セメスター(前期), 物理入門
  5. 2019年, 学部専門, 2ターム, Frontiers of Material Science (物質科学の最前線)
  6. 2019年, 学部専門, 1ターム, 物理科学概論
  7. 2019年, 学部専門, 3ターム, 電磁気学II
  8. 2019年, 学部専門, 1ターム, 物質科学実験C
  9. 2019年, 学部専門, 1ターム, 物質科学実験法C
  10. 2019年, 修士課程・博士課程前期, セメスター(前期), 総合科学演習
  11. 2019年, 修士課程・博士課程前期, セメスター(後期), 総合科学演習
  12. 2019年, 修士課程・博士課程前期, セメスター(後期), 特別研究(総合物理研究)
  13. 2019年, 修士課程・博士課程前期, 3ターム, 相関系計測論
  14. 2019年, 博士課程・博士課程後期, セメスター(前期), 21世紀科学プロジェクト研究演習

研究活動

学術論文(★は代表的な論文)

  1. Tunneling spectra of break junctions involving Nb3Sn, LOW TEMPERATURE PHYSICS, 40巻, 10号, pp. 925-928, 201410
  2. Dynamics and mechanism of oxygen annealing in Fe1+yTe0.6Se0.4 single crystal, SCIENTIFIC REPORTS, 4巻, 20140403
  3. Variable electronic stripe structures of the parent iron-chalcogenide superconductor Fe1+dTe observed by STM-STS, PHYSICAL REVIEW B, 90巻, 22号, 20141202
  4. Scanning-tunneling microscopy and break-junction spectroscopy on the superconducting Fe(Se, Te) single crystal, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 484巻, pp. 22-26, 201301
  5. ★, Tunneling break-junction measurements of the superconducting gap in Y2C3, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 484巻, pp. 52-55, 201301
  6. ★, STM/STS and break-junction tunneling spectroscopy of FeSe1-xTex, LOW TEMPERATURE PHYSICS, 39巻, 3号, pp. 265-273, 201303
  7. Superconducting beta-ZrNClx probed by scanning-tunnelling and break-junction spectroscopy, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 494巻, pp. 89-94, 201311
  8. Nanoscale electronic structure of the layered nitride superconductors alpha-KxTiNCl and beta-HfNCly observed by scanning tunneling microscopy and spectroscopy, PHYSICAL REVIEW B, 85巻, 14号, 20120417
  9. Specific heat and Tunneling Spectroscopy study of NbB2 with maximum T-c similar to 10K, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 76巻, 9号, 200709
  10. Break-Junction Spectroscopy of Ce(Fe,Co)2 Physica B 284-288 (2000) 1327-1328., Physica B, 284-288巻, pp. 1327-1328, 20000401
  11. Probing the normal-state gap in high-Tc superconductors by break-junction tunneling, J. Phys. and Chem. Solids, 62巻, pp. 149-152, 20010401
  12. Tunneling spectroscopy of various underdoped Bi2Sr2CaCu2O8+., Physica C, 357-360巻, pp. 130-133, 20010401
  13. Tunneling spectroscopy of the energy gap in semiconducting La1.98Sr0.02CuO4, Physica C, 357-360巻, pp. 158-161, 20010401
  14. Tunneling spectroscopy of the nornal-state gap in (Bi,Pb)2Sr2Ca2Cu3O10+d, Phys. Rev. B, 64巻, pp. 092510-1 to 4, 20010401
  15. Synthesize of the binary intermetallic superconductor MgB2 under hydrogen pressure, J. Alloys and Compounds, 335巻, pp. L21-L24, 20020401
  16. Energy gap in the Kondo semiconductor CeRhAs, Physica B, 312-313巻, pp. 221-223, 20020401
  17. Superconducting gap in polycrystalline MgB2 stdied by electron tunneling, Physica C, 378-381巻, pp. 229-233, 20020401
  18. Tunneling spectroscopy of MgB2 and Li0.5(THF)yHfNCl, Physica B, 328巻, pp. 23-25, 20030401
  19. Tunneling spectroscopy of the electron-doped layered superconductor Li0.48(THF)0.3HfNCl, Physica C, 388-389巻, pp. 573-574, 20030401
  20. Multiple-gap structure of the binary superconductor MgB2, Physica C, 388-389巻, pp. 147-148, 20030401
  21. Tunneling spectroscopy of the superconducting gap in MgB2., Phys. Rev. B, 67巻, pp. 094504-1 to 6, 20030401
  22. Possible application of carbon nanotubes to the field emission electron source for portable betatrons, Nucl.Instr.and Meth.in Phys.Res.=B109/110, A539巻, pp. 16-24, 20050401
  23. Break-junction tunneling spectra of MgB2 Influence of boron quality, Physica C, 426-431巻, pp. 450-453, 20050401
  24. Spin-dependent tunneling in a magnetic field for junctions involving normal and superconducting CDW metals, Acta Physica Polonica A, 109巻, pp. 477-484, 20060401
  25. Tunneling spectroscopy of AlB2 type silicide CaAlSi, Physica B, 383巻, pp. 80-81, 20060401
  26. Tunneling spectroscopy of single-crystal clathrate Ba8Ga16Sn30, Physica B, 383巻, pp. 126-127, 20060401
  27. Electron tunneling experiments on La-substituted Kondo semiconductor CeRhAs, Physica B, 383巻, pp. 26-27, 20060401
  28. Tunneling spectroscopy of the electron-doped superconductors MNCl0.7 (M= Hf, Zr), Physica C, 445-448巻, pp. 77-79, 20060401
  29. Spin dependent tunneling current in junctions involving CDW metals, Jpn. J. Appl. Phys., 45巻, pp. 2242-2245, 20060401
  30. Spin dependent splitting of the tunnel conductivity peaks in the magnetic field for junctions involving CDW metals, Physica B, 378-380巻, pp. 567-568, 20060401
  31. Tunneling measurements of CeRhAs single crystal, Physica B, 378-380巻, pp. 786-787, 20060401
  32. Current carrier localization and coulomb gap observed in SrPbO3-エ by transport measurements and tunnel spectroscopy, Physica B: Condensed Matter, 17巻, pp. 7407-7416, 20050401
  33. Tunneling spectroscopy of deintercalated layered nitride superconductors ZrNCl0.7, J. Phys. Soc. Japan, 74巻, pp. 2586-2591, 20050401
  34. Manifestations of inhomogeneity in MgB2: From specific heat to tunnel measurements, Physica B, 359-361巻, pp. 460-462, 20050401
  35. Enhancement of the paramagnetic limit for superconductors with charge-density waves, Physica C, 426-431巻, pp. 325-329, 20050401
  36. Point-contact spectroscopy measurements of binary superconductor MgB2, Physica C, 426-431巻, pp. 300-303, 20050401
  37. Electrical resistivity and tunneling anomalies in CeCuAs2, Physica B, 359-361巻, pp. 108-110, 20050401
  38. Spin-polarized electron tunneling between charge-density-wave metals, Low Temp. Phys., 31巻, pp. 59-72, 20050401
  39. Pauli effect of the magnetic field on superconductors with charge-density waves, Low Temp. Phys., 31巻, pp. 41-46, 20050401
  40. Superconducting energy gap from break-junction tunneling spectroscopy in the ternary silicide CaAlSi, Phys. Rev. B, 76巻, 10号, pp. 104508-(1-5), 20070901
  41. Charge-Density-Wave origin of Dip-Hump Structures in the Tunnel Spectra of Bi2Sr2CaCu2O8+d, Acta Physica Polonica A, 111巻, 4号, pp. 573-580, 20070401
  42. Evidence for the Fine Pseudogap at the Fermi Level in Al-based Quasicrystals, Journal of the Physical Society of Japan, 76巻, 3号, pp. 033707-(1-4), 20070301
  43. Analysis of the pseudogap-related structure in tunneling spectra of superconducting Bi2Sr2CaCu2O8+d revealed by the break-junction technique, Physical Review B, 76巻, 18号, pp. 180503-(1-4), 20071101
  44. Scanning tunnelling microscopy and spectroscopy of MgB2, Joural of Physics: Conference Series, 61巻, pp. 278-282, 20070501
  45. Observation of local barrier height and electronic structure on cuprate superconductor by STM/STS, Journal of Physics Conference Series, 100巻, pp. 052003/1-4, 20080301
  46. Nanoscale Modulation of Local Barrier Height on Bi-based Cuprate Superconductors Observed by Scanning Tunneling Microscopy/Spectroscopy, Journal of the Physical Society of Japan, 77巻, pp. 043705/1-4, 20080401
  47. STM Observation on Layered Nitride Superconductor KxTiNCl, Journal of Physics: Conference Series, 150巻, pp. 052251/1-4, 20090401
  48. Scanning Tunneling Microscopy/Spectroscopy on Multi-Layered Cuprate Superconductor Ba2Ca5Cu6O12(O1-xFx)2, Physica C, 469巻, pp. 1020-1023, 20090601
  49. Semiconducting gap of Nd1.85Ce0.15CuO4 revealed by break junction tunneling spectroscopy, Journal of Physics: Conference Series, 150巻, pp. 052046/1-4, 20090401
  50. Temperature-dependent pseudogap-like features in tunnel spectra of high-Tc cuprates as a manifestation of charge-density waves, Journal of Physics: Condensed Matter, 20巻, pp. 425218/1-15, 20080501
  51. Pseudogap-like phenomena in cuprates as a manifestation of charge-density waves, Acta Physica Polonica A, 114巻, pp. 59-66, 20080601
  52. Observation of local barrier height and electronic structure on cuprate superconductor by STM/STS, Journal of Physics: Conference Series, 100巻, pp. 052003/1-4, 20080501
  53. Tunnel spectra of junctions involving BSCCO and other cuprates: superconducting and charge-density-wave gapping, Physica C, 468巻, pp. 1145-1147, 20080601
  54. Charge-density-wave features in tunnel spectra of high-Tc superconductors, Journal of Physics: Conference Series, 150巻, pp. 052047/1-4, 20090401
  55. Tunneling spectroscopy of layered superconductors : intercalated Li0.48(C4H8O)xHfNCl and De-intercalated HfNCl0.7, The European Physical Journal B, 73巻, pp. 471-482, 20100201
  56. Scanning Tunneling Spectroscopy and Break Junction Spectroscopy on Iron-Oxypnictide Superconductor NdFeAs(O0.9 F0.1), Physica C, 470巻, pp. 1070-1072, 20101101
  57. Atomic-scale spot structures and gap distributions on apical-fluorine cuprate superconductor Ba2Ca5Cu6O12 (O 1-x Fx)2 observed by STM/STS, Physica C, 470巻, pp. S160-S162, 20101101
  58. Tunneling Break-Junction Spectroscopy on the Superconductor NdFeAs(O0.9F0.1), Physica C, 470巻, pp. S358-S359, 20101101
  59. STM/STS Measurements of the Layered Superconductor β-HfNCl1-x, Physica C, 470巻, pp. S725-S727, 20101101
  60. Atomic surface structures on multi-layered cuprate superconductor Ba2Ca4Cu5O10(O1-x Fx)2 observed by STM, Physica C, 471巻, pp. 698-700, 20111001
  61. Scanning tunneling microscopy on iron-chalcogenide superconductor Fe(Se,Te) single crystal, Physica C, 471巻, pp. 622-624, 20111101
  62. Competition of superconductivity and charge-density-waves in cuprates: recent evidence and interpretation, Advances in Condensed Matter Physics, 2010巻, pp. 681070(1-40), 20101001
  63. STM/STS Observation on Layered Nitride Superconductor alpha-(DDA)xTiNCl, Journal of Physics: Conference Series, 400巻, pp. 022112/1-4, 20121201
  64. Phase diagram for coexisting d-wave superconductivity and charge-density-waves; cuprates and beyond, Journal of Physics: Condensed Matter, 23巻, pp. 385701(1-22), 20110401
  65. d-Wave Superconductivity and s-Wave Charge Density Waves: Coexistence between Order Parameters of Different Origin and Symmetry, Symmetry, 3巻, pp. 1-47, 20110301
  66. Nano-scale stripe structures on FeTe observed by low temperature STM/STS, Physics Procedia, 45巻, pp. 85-88, 20130501
  67. Anisotropic transport and magnetic properties and magnetic-polaron-like behavior in CeTe2-x, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 69巻, 3号, pp. 937-944, 200003
  68. Tunneling spectroscopy of RTe2 (R = La, Ce) and possible coexistence between charge-density waves and magnetic order, PHYSICAL REVIEW B, 63巻, 3号, 20010115
  69. Magnetic and transport properties or the pseudobinary systems Ce(Fe1-xCox)(2) and (Ce1-ySc)Fe-2, PHYSICAL REVIEW B, 63巻, 5号, 20010201
  70. Observation of a pseudogap in alpha-AlMnSi by break-junction tunneling spectroscopy, JOURNAL OF NON-CRYSTALLINE SOLIDS, 312-14巻, pp. 513-516, 2002
  71. Tunneling spectroscopy of MgB2 and Li-0.5(THF)(y)HfNCl, PHYSICA B-CONDENSED MATTER, 328巻, 1-2号, pp. 23-25, 200304
  72. Tunneling spectroscopy of the superconducting gap in MgB2, PHYSICAL REVIEW B, 67巻, 9号, 20030301
  73. Tunneling measurements of superconducting NbB2, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 408巻, pp. 828-829, 200408
  74. Formation of midgap states and ferromagnetism in semiconducting CaB6, PHYSICAL REVIEW B, 69巻, 11号, 200403
  75. Enhanced paramagnetic limit of the upper critical magnetic field for superconductors with charge-density waves, JOURNAL OF PHYSICS-CONDENSED MATTER, 16巻, 21号, pp. 3681-3690, 20040602
  76. Multiple-gap features from break-junction tunneling in the superconducting MgB2, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 73巻, 7号, pp. 1902-1913, 200407
  77. Tunnel currents in charge-density-wave metal-insulator-charge-density-wave metal structures: Magnetic field-induced spin-splitting of the conductance peaks, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 73巻, 7号, pp. 1931-1937, 200407
  78. Energy gap structure in the binary superconductor MB2 (M = Nb and Mg), PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 412巻, pp. 266-269, 200410
  79. Paramagnetic effect of magnetic field on superconductors with charge-density waves, LOW TEMPERATURE PHYSICS, 31巻, 1号, pp. 41-46, 200501
  80. Spatially heterogeneous character of superconductivity in MgB2 as revealed by local probe and bulk measurements, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 426巻, pp. 230-233, 20051001
  81. Tunneling spectroscopy of layered nitride superconductors MNCl0.7 (M = Hf and Zr), PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 445巻, pp. 77-79, 20061001
  82. Evidence of the fine pseudogap at the fermi level in Al-based quasicrystals, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 76巻, 3号, 200703
  83. Observation of the gap distribution on multi-layered cuprate superconductor Ba2Ca4Cu5O10(O1-x, Fx)2 by STM/STS, Physics Procedia, 58巻, pp. 78-81, 20140923
  84. Break junction tunneling spectroscopy of superconducting FeSexTe1-x, Physics Procedia, 65巻, pp. 65-68, 2015
  85. Tunneling STM/STS and break-junction spectroscopy of the layered nitro-chloride superconductors MNCl (M = Ti, Hf, Zr), Journal of Physics Conference Series, 507巻, pp. 012010-1-012010-5, 2014
  86. Combined break-junction tunneling and STM/STS studies of the β-tungsten-type superconductor Nb3Sn below and above Tc, Journal of Energy Challenges and Mechanics(Accepted&in print), pp. 1-6
  87. The spatial distributions of large gap-like structure on Fe(Se,Te) single crystals observed by STM/STS, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 518巻, pp. 23-27, 20151115
  88. Hybridization gaps and antiferromagnetic gap in the Kondo semiconductors CeT2Al10 (T = Fe and Os) observed by break- junction tunneling spectroscopy, PHYSICAL REVIEW B, 92巻, 20号, 20151124
  89. Combined break-junction tunneling and STM/STS studies of the β-tungsten-type superconductor Nb3Sn below and above Tc, Journal of Energy Challenges and Mechanics, 2巻, pp. 138-142, 2015
  90. Influence of the spatially inhomogeneous gap distribution on the quasiparticle current in c-axis junctions involving d-wave superconductors with charge density waves, JOURNAL OF PHYSICS-CONDENSED MATTER, 28巻, 44号, pp. 445701_1-445701_10, 20161109
  91. ★, Doping effects on the hybridization gap and antiferromagnetic order in the Kondo semiconductor CeOs2Al10 studied by break-junction experiments, PHYSICAL REVIEW B, 95巻, 3号, 20170115
  92. ★, Multilayered cuprate superconductor Ba$_2$Ca$_5$Cu$_6$O$_{12}$(O$_{1-x}$,F$_x$)$_2$ studied by temperature dependent scanning tunneling microscopy and spectroscopy, Physical Review B, 95巻, pp. 174508_1-174508_11, 20170516
  93. Scanning Tunneling Microscopy and Spectroscopy of the Layered Nitride Superconductor a-NaxTiNCl, Physics Procedia, 81巻, pp. 73-76, 2016
  94. Interplay between hybridization gaps and antiferromagnetic gap in the hole-doped Kondo semiconductor Ce(Os1-yRey)2Al10, Journal of Physics; Conference Series, 807巻, pp. 012008_1-012008_6, 2017
  95. ★, Gap features of layered iron-selenium-tellurium compound below and above the superconducting transition temperature by break-junction spectroscopy combined with STS, IOP Conference Series: Materials Science and Engineering, 369号, pp. 012024-1-012024-7, 20180725
  96. ★, STM/STS and break-junction study of multi-layered Ba2Can-1CunO2n(O,F)2(n=5,6) and underdoped Bi2Sr2CaCu2O8+δ superconductors with the similar Tc ~ 70 K, J. Energy Challenges and Mechanics, 5巻, 1号, pp. 1-16, 201807

著書等出版物

  1. 2007年10月, Superconductivity Research Advances, Editor: James E. Nolan, COMPETITION BETWEEN SUPERCONDUCTIVITY AND CHARGE CARRIER LOCALIZATION IN PLUMBATES, NOVA SCIENCE PUBLISHERS, INC., 2007年, 10, 単行本(学術書), 共著, ENGLISH, A.M. Gabovich, V.A. Drozd, M. Pekala, T. Ekino, R. Ribeiro,, 978600216916, 55
  2. 2012年03月, Superconductivity: Theory, Materials and Applications, ed. by V.R. Romanovskií, he discovery of novel high-Tc superconductivity in MgB2 (Tc = 39.5 K) and Li0.48(THF)yHfNCl (Tc = 25.5 K) initiated substantial progress in the field of superconductivity physics and its applications despite the fact that competing high-Tc cuprates remain the world leaders in almost all practically important superconducting parameters. This article describes electron tunneling and point-contact experimental studies of the indicated two materials and related substances, being crucial to elucidate the character of the quasiparticle energy spectrum both in superconducting and normal state. The account is based mostly on our own experiments, although works carried out in other laboratories are taken into account as well. We studied superconducting gap structures by means of break-junction tunneling spectroscopy (BJTS), scanning tunneling spectroscopy (STS) and point-contact spectroscopy (PCS)., Tunneling Spectroscopy of Novel Layered Superconductors: MgB2, Li0.48(THF)xHfNCl and Related Substances, Nova Science Publishers, Inc. New York, 2012年, 03, 単行本(学術書), 共著, 9781613248430, 110
  3. 2015年08月01日, SUPERCONDUCTORS NEW DEVELOPMENTS, Ed. A.M. Gabovich, Gap Structures of A-15 Alloys from the Superconducting and Normal-State Break-Junction Tunnelling pp.55-72, 2015年, 単行本(学術書), 共著, 978-953-51-2133-6, 270, 22

招待講演、口頭・ポスター発表等

  1. STM/STS and break junction tunneling spectroscopy of Fe(X(= Se,S), Te), T. Ekino, International Conference on Nanoscience and Technlogy (ICNT2012), Paris-Sorbonne University, 2012 July 21-27., 2012年07月26日, 通常, 英語
  2. 鉄カルコゲナイド超伝導体及びその母物質における局所状態密度の変調構造(2), 杉本暁,浴野稔一, 日本物理学会 第68回年次大会, 2013年03月29日, 通常, 日本語
  3. Superconducting gap of b-HfNCl and related compounds investigated by scanning tunneling microscopy / spectroscopy and break-junction tunneling, T. EKINO, International Conference on Nanoscience and Nanotechnology, 2013年09月12日, 通常, 英語, PARIS
  4. Tunneling STM/STS and break junction spectroscopy of the layered superconductors b-MNClx (M = H for Zr), T. EKINO, European Conference on Applied Superconductivity, 2013年09月19日, 通常, 英語, GENOVA
  5. STM/STSによる頂点フッ素系多層超伝導体Ba2Ca4Cu5(O,F)xにおけるギャップ分布観測, 杉本暁, 田中勝大, 峰田恭平, 田辺健治, 常磐和靖, 浴野稔一, 日本物理学会秋季大会, 2013年09月26日, 通常, 日本語, 日本物理学会, 徳島市
  6. STM/STS and break junction tunneling spectroscopy of the layered nitro-chloride superconductors, T. EKINO, International workshop on Novel superconductors and super materials, 2013年11月22日, 通常, 英語
  7. 層状窒化物超伝導体NaxTiNClのSTM/STS観測, 坂井優太, 杉本暁, S. Zhang, 田中将嗣, H. Zhu, 山中昭司, 浴野稔一, 日本物理学会年次大会, 2014年03月27日, 通常, 日本語, 日本物理学会, 平塚市
  8. STS/STM of the layered iron-chalcogenide and nitro-chloride superconductors, T. EKINO, AnalytiX-2014, 2014年04月28日, 通常, 英語
  9. STM/STSを用いた鉄カルコゲナイド鉄カルコゲナイド超伝導体FeSexTe1-xの局所障壁高さとトンネルスペクトルの観測, 杉本暁, 坂井優太, 浴野稔一, 日本物理学会年次大会, 2014年03月27日, 通常, 日本語
  10. 層状窒化物超伝導体NaxTiNClの電子状態密度の観測, 坂井優太, 杉本暁, S. Zhang, 田中将嗣, H. Zhu, 山中昭司, 浴野稔一, 日本物理学会秋季大会, 2014年09月09日, 通常, 日本語
  11. Suppression of hybridization gap and antiferromagnetic order by electron- and hole- doping in the Kondo Semiconductor CeOs2Al10, J. KawabataA, Y. YamadaA, K. UmeoA,B, T. TakabatakeA,C, Y. MuroD, SCES2014, 2014年07月07日, 通常, 英語
  12. STM/STSによる鉄カルコゲナイド超伝導体FeSexTe1-xにおける過剰鉄スポット形状と電子状態の観測, 杉本暁, 坂井優太, 浴野稔一, 日本物理学会秋季大会, 2014年09月09日, 通常, 日本語
  13. トンネル分光による近藤半導体CeT2Al10(T = Fe, Os)の擬ギャップ構造の観測, 川端丈A,山田義大A,高畠敏郎A,B,坂井優太C,杉本暁C,浴野稔一C, 日本物理学会 2014年秋季大会, 2014年09月09日, 通常, 日本語
  14. The spatial distributions of large pseudo gap on Fe(Se, Te) single crystals observed by STM/STS, A. SUGMOTO, T. EKINO, et al., International Symposium on Superconductivity (ISS2014), 2014年11月27日, 通常, 英語, Tokyo
  15. Break junction tunneling spectroscopy of superconducting FeSexTe1-x (x= 0.4-0.5) with our STM/STS result, T. EKINO, International Symposium on Superconductivity (ISS2014), 2014年11月27日, 通常, 英語, Tokyo
  16. 破断接合法トンネル分光による近藤半導体CeT2Al10(T = Fe, Os)のギャップ構造の観測, 川端丈A,山田義大A,高畠敏郎A,B,坂井優太C,杉本暁C,浴野稔一C,室裕司D, 日本物理学会 第70回年次大会, 2015年03月23日, 通常, 日本語
  17. Break Junction Tunneling Spectroscopy of Kondo Semiconductors CeT2Al10(T = Fe, OS), J. Kawabata, Y. Yamada, T. Takabatake, Y. Sakai, A. Sugimoto, T, Ekino, Y. Muro, ICM2015, 2015年07月07日, 通常, 英語
  18. Tunnelling measurements of Nb3Sn break junctions below and above the superconducting critical temperature, T. EKINO, Fourth International Symposium on Energy Challenges and Mechanics - working on small scales, 2015年08月13日, 招待, 英語, North Sea Conference & Journal, Aberdeen, SCOTLAND, UK
  19. STM/STSを用いた鉄カルコゲナイド超伝導体母物質FeTeにおける周期的変調構造のバイアス電圧依存性, 杉本 暁*, 長坂 康平, 浴野 稔一, 日本物理学会秋季大会, 2015年09月16日, 通常, 日本語
  20. 破断接合法トンネル分光で観測した近藤半導体CeOs2Al10の5d電子・正孔ドープによるギャップ構造の抑制, 川端丈A, 山田義大A, 高畠敏郎A, B, 坂井優太C, 杉本暁C, 浴野稔一C, 室裕司D, 日本物理学会 2015年秋季, 2015年09月17日, 通常, 日本語
  21. 鉄セレン系超伝導体のトンネル分光 によるエネルギーギャップの測定, 長坂 康平, 杉本 暁, 浴野 稔一, 日本物理学会秋季大会, 2015年09月19日, 通常, 日本語
  22. Scanning Tunnelling Microscopy and Spectroscopy on the Layered Nitride Superconductor α-NaxTiNCl, Akira Sugimoto , Yuta Sakai, Toshikazu Ekino, Shuai Zhang, Masashi Tanaka, Shoji Yamanaka, A. M. Gabovich, 28th International Symposium on Superconductivity, ISS 2015, 2015年11月18日, 通常, 英語
  23. COMBINED STUDY OF THE ENERGY GAP IN FeSexTe1-x SUPERCONDUCTOR BY BREAK-JUNCTION AND SCANNING TUNNELING SPECTROSCOPY, 浴野稔一, 2017年03月24日, 招待, 英語, 福岡, Single crystals of FeSexTe1-x superconductors were investigated by scanning tunneling microscopy/spectroscopy (STM/STS). We mainly focus on the compositions x = 0.4 – 0.5 showing the superconducting critical temperature Tc = 15 K. The BJTS method revealed a BCS-like gap structure with the values 2Δ (T ≈ 4 K) = 2.5 – 7 meV and the broadening parameter Γ < 0.1 Δ. The observed wide gap distribution can be due to either the local electronic inhomogeneity or the manifestations of the gaps from different Fermi surfaces. The largest normalized gap value becomes 2Δ/kBTc ≈ 5. From the STS measurements, the gap value 2Δ = 20 – 40 meV is detected locally in the superconducting state, which turns out to be much larger than that observed in the BJTS. Such a gap shape tends to appear at the excess Fe atoms in nm regions on the surface of iron-chalcogenide layer. In the high-bias BJTS, the samples with x = 0.4 – 0.5 demonstrate V-shape gaps at T ≈ 4 K with the peak intervals eVp-p = 4Σ = 80 – 160 meV. This hump structure forms the normal-state gap above Tc. Such behaviour is similar to the partially gapped density-wave superconductor involving both superconducting gap and pseudogap, which has been adapted to high-Tc cuprates [2]. Since the normal-state gap survives up to T* ≈ 60 – 100 K, the normalized gap value 2Σ/kBT* becomes ~ 9 - 13. Most probably, the normal-state gap is induced by charge-density waves, for which 2Σ/kBT* is anomalously high, as was observed for the quasi one-dimensional compounds [5]. These results suggest that the present normal-state gap is generated by the partial Fermi surface instability inherent to the low-dimensional electronic structures. The possible origins are discussed in terms of the local phase transition reducing the crystal symmetry due to strains and inhomogeneity. The mesurements of FeSe and non-superconducting FeTe will be also presented and discussed. [2] A.M. Gabovich, A.I. Voitenko, et al., Adv. Condens. Matter Phys. 2010, 681070 (2010). [3] T. Ekino, J. Akimitsu, Jpn. J. Appl. Phys. 26, 625 (1987).
  24. STM/STS study of the multi-layered flourine-substituted high-Tc superconductor Ba2Can-1CunO2n (O,F)2 (F02(n-1)n) (n=5,6), 浴野稔一, 2017年08月15日, 招待, 日本語
  25. Combined study of FeSexTe1-x by break junction and scanning tunneling spectroscopy -Mutual comparison of BJTS and STS spectra-, EKINO Toshikazu, SUGIMOTO Akira, Alexander GABOVICH, IBS 2016 Advances in preparation and investigation of emergent Iron-Based Superconductors, 2016年05月23日, 招待, 英語, Leibniz Institute for Solid State and Materials Research Dresden B.Verkin Institute for Low Temperature Physics and Engineering, Dresden, Germany, We investigated the energy gap in FeSexTe1-x single crystal with the bulk superconducting critical temperature Tc = 15 K, which is considerably higher than that for the pure FeSe. The measurements were carried out in a wide temperature range below and above Tc by the break-junction tunneling spectroscopy (BJTS) to maintain a fresh and unaffected surfaces. The scanning tunneling microscopy/spectroscopy (STM/STS) technique was also employed to survey the complementary density-of-states data. The BJTS method dealing with SIS (superconductor - insulator - superconductor) junctions revealed a Bardeen-Cooper-Schrieffer-like gap structure with the values 2Δ (T ≈ 4 K) = 2.5 – 7 meV and the broadening parameter not less than 0.1 Δ [1]. The wide gap distribution was detected, which is believed to originate either form the local electron spectrum inhomogeneity or from the manifestations of the gap belonging to different Fermi surfaces [2]. The largest gap value from the distribution corresponds to 2Δ/kBTc ≈ 5 being similar to our BJTS results for NdFeAsOF with Tc = 48 K and suggesting the same kind of the strong-coupling Cooper pairing [3]. Besides the conventional superconducting gap features, the high-bias BJTS demonstrates a V-shape gap structure at T ≈ 4 K with the peaks at ± 40 – 80 mV. In some measurements, those features may also appear as humps outside the superconducting-gap peak in a manner similar to the observations in high-Tc cuprates [4]. STM/STS measurements show that such a V-gap appears at the excess Fe atoms on the surface of iron-chalcogenide layer, clustering in nm regions. Since the V-gap structure survives up to T* ≈ 60 – 100 K, the gap-to-T* ratio is in the range 8 – 13. This characteristic value shows that the high-energy gaps are not connected to superconductivity with the corresponding smaller gaps discussed above. Most probably, larger (normal-state) gaps are induced by charge density waves, for which the ratio between the energy gap at zero T to the critical temperature is anomalously high, as was demonstrated many years ago for the quasi one-dimensional conductors [5]. Those results suggest that the normal-state gap observed here is generated by the electron spectrum instability leading to the partial Fermi surface gapping, inherent to the low-dimensional electronic structures. The possible specific origin is discussed in terms of the structural/magnetic phase transition locally reducing the crystal symmetry of FeSexTe1-x, the distribution of T* being naturally understood as driven by the existence of local strains and inhomogeneity. [1] T. Ekino, K. Nagasaka, Y. Sakai, A. Sugimoto, A.M. Gabovich, Physics Procedia 65, 65(2015). [2] H. Miao, P. Richard, Y. Tanaka, et al., Phys. Rev. B 85, 094506 (2012). [3] T. Ekino, A. Sugimoto, H. Okabe, K. Shohara, R. Ukita, et al., Physica C 470, S358 (2010). [4] A.M. Gabovich, A.I. Voitenko, et al., Adv. Condens. Matter Phys. 2010, 681070 (2010). [5] T. Ekino, J. Akimitsu, Jpn. J. Appl. Phys. 26, 625 (1987).
  26. Gap features of layered iron-selenium-tellurium compound below and above the superconducting transition temperature by break-junction spectroscopy combined with STS, 浴野稔一, A Sugimoto and A M Gabovich, 2018 Grobal Conference on Polymer and composite Materials PCM2018, 2018年04月11日, 招待, 英語, Global Conference on Polymer and Composite Materials, 北九州

社会活動

学術会議等の主催

  1. "先端機能物質の伝導現象と熱現象 (Thermal and Transport Properties of Advanced Materials)", シンポなど組織委員, 2002年08月

その他社会貢献活動(広大・部局主催含)

  1. 第15回物理教育研究会, 理科教育ワークショップVII, 広島県物理教育研究推進会, 2011年/02月/19日, 2011年/02月/19日, 広島県情報プラザ, 運営参加・支援, セミナー・ワークショップ, 教育関係者
  2. 広島市子ども文化科学館, 電子工作教室, 公益財団法人広島市文化財団, 2016年/12月/18日, 2016年/12月/18日, 広島市子ども文化科学館, 講師, その他, 中学生
  3. 第19回物理教育研究会, 理科教材ワークショップ, 広島県物理教育研究推進会, 2015年/02月/21日, 2015年/02月/21日, 広島県情報プラザ, 企画, セミナー・ワークショップ, 教育関係者

学術雑誌論文査読歴

  1. 2013年, Solid State Communications, その他, 1
  2. 2013年, SUPERCONDUCTOR SCIENCE AND TECHNOLOGY, その他, Reviewer, 2
  3. 2013年, Current Opinion in Solid State & Materials Science, その他, Reviewer, 1
  4. 2013年, Physical Review Letters, その他, Reviewer, 3
  5. 2013年, Semiconductor Science and Technology, その他, Reviewer, 1
  6. 2014年, Semiconductor Science and Technology, その他, Reviewer, 1
  7. 2014年, Measurement Science and Technology, その他, Reviewer, 1
  8. 2014年, Physical Review B, その他, Reviewer, 3
  9. 2014年, Superconductor Science and Technology, その他, Reviewer, 1
  10. 2014年, Journal of Physics Condensed Matter, その他, Reviewer, 2
  11. 2014年, Applied Surface Science, その他, Reviewer, 1
  12. 2015年, Applied Surface Science, その他, Reviewer, 1
  13. 2015年, Materials Chemistry and Physics, その他, Reviewer, 1
  14. 2015年, Solid State Communications, その他, Reviewer, 1
  15. 2015年, Superconductor Science and Technology, Reviewer, 1
  16. 2015年, Physica C, その他, Reviewer, 1
  17. 2015年, Journal of the Physical Society of Japan, その他, Reviewer, 1
  18. 2015年, Physical Review B, その他, Reviewer, 1
  19. 2015年, Journal of Physics Condensed Matter, その他, Reviewer, 1
  20. 2015年, Journal of Physics D: Applied Physics, その他, Reviewer, 1
  21. 2016年, その他, 査読委員, 1
  22. 2016年, その他, 査読委員, 2
  23. 2016年, その他, 査読委員, 1
  24. 2017年, その他, 査読委員, 2
  25. 2017年, その他, 査読委員, 1
  26. 2017年, その他, 査読委員, 1
  27. 2017年, Scientific Reports, その他, 査読, 1
  28. 2017年, Nanotechnology, その他, 査読, 1
  29. 2018年, Journal of Physics: Condensed Matter, その他, 査読, 1
  30. 2018年, Superconductor Science and Technlogy, その他, 査読, 1
  31. 2018年, Physical Review Letters, その他, 査読, 1