akira sugimoto

Last Updated :2024/06/04

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Associate Professor
E-mail
asugimotohiroshima-u.ac.jp
Self-introduction
We are investigating electronic states on various superconductors and related materials. Using a scanning tunneling microscope that can observe the atomic arrangement on the surface of a superconductor, we observe the electronic density of state by tunneling spectroscopy in each atom. Furthermore, together with the break junction tunneling spectroscopy, we will clarify the superconducting mechanism and the lead to the higher-performance superconductors.

Basic Information

Academic Degrees

  • Doctor of Science, Tokyo Institute of Technology
  • Master of Science, Tokyo Institute of Technology

Research Fields

  • Mathematical and physical sciences;Physics;Condensed matter physics II

Research Keywords

  • STM
  • nano science
  • Tunneling spectroscopy
  • superconductor
  • Cuprate superconductors
  • Layered nitride superconductors
  • Iron superconductors

Educational Activity

Course in Charge

  1. 2024, Liberal Arts Education Program1, 3Term, Experimental Methods and Laboratory Work in Physics I
  2. 2024, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Physics I
  3. 2024, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Physics I
  4. 2024, Liberal Arts Education Program1, 4Term, Experimental Methods and Laboratory Work in Physics II
  5. 2024, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Physics II
  6. 2024, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Physics II
  7. 2024, Liberal Arts Education Program1, First Semester, Introduction to Physics
  8. 2024, Undergraduate Education, Second Semester, Laboratory Work in Natural Sciences
  9. 2024, Undergraduate Education, Second Semester, Practical Methods in Natural Sciences
  10. 2024, Undergraduate Education, 2Term, Electromagnetism I
  11. 2024, Undergraduate Education, 1Term, Introduction to Physical Sciences
  12. 2024, Undergraduate Education, 3Term, Laboratory Work in Material Sciences A
  13. 2024, Undergraduate Education, 3Term, Experimental Methods for Materials Sciencs A
  14. 2024, Undergraduate Education, 1Term, Laboratory Work in Material Sciences C
  15. 2024, Undergraduate Education, 1Term, Experimental Methods for Materials Sciencs C
  16. 2024, Undergraduate Education, 2Term, Frontiers of Material Science
  17. 2024, Graduate Education (Master's Program) , First Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering A
  18. 2024, Graduate Education (Master's Program) , Second Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering B
  19. 2024, Graduate Education (Master's Program) , 3Term, Transdisciplinary Science and Engineering Program Common Subjects 2 (Green Development)
  20. 2024, Graduate Education (Master's Program) , 3Term, Spectroscopies of Correlated Matter

Research Activities

Academic Papers

  1. Observation of periodic structures and pseudogaps in pristine compound alpha-TiNCl by STM/STS and break junction methods, Low Temperature Physics/Fizyka Nyzkykh Temperatur, 49, 954-959, 20230529
  2. Coexistence of superconductivity and charge-density waves: evidence from tunneling studies, Low Temperature Physics/Fizyka Nyzkykh Temperatur, 49, 881-898, 20230529
  3. Nano-scale Gap Features on Layered Nitride Chloride Superconductor alpha-NaxTiNCl and Pristine alpha-TiNCl Observed by STM/STS, JPS Conference Proceedings, 38, 011035-1-011035-6, 20230523
  4. STM/STS study of the local density of states in Cu doped Fe(Se,Te) superconductors, Journal of Physics: Conference Series, 2323, 012010-1-012010-6, 20220801
  5. Tunneling and break junction spectroscopy of the ambient-pressure semiconducting and superconducting gap structures in the ladder compound (Sr, Ca)(14)Cu24O41, PHYSICAL REVIEW B, 104(5), 054514, 20210819
  6. Tunneling STM/STS and break-junction spectroscopy of the Pb-doped Bi2223 superconductor, Journal of Physics: Conference Series, 1975, 012015, 20210701
  7. Comparative study of superconducting and normal-state anisotropy in Fe1+yTe0.6Se0.4 superconductors with controlled amounts of interstitial excess Fe, PHYSICAL REVIEW B, 103(22), 224506, 20210602
  8. ★, Nano-scale periodic structures and gap distribution in Pb-doped Bi2223 cuprate superconductors observed by STM/STS, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 33(9), 20200901
  9. Atomic structures and nanoscale electronic states on the surface of MgB2 superconductor observed by scanning tunneling microscopy and spectroscopy, LOW TEMPERATURE PHYSICS, 45(11), 1209-1217, 20191101
  10. 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(1), 012024/1-012024/7, 20180601
  11. STM/STS and break-junction study of multi-layered Ba2Ca n-1CunO2n (O,F)2(n=5,6) and underdoped Bi2Sr2CaCu2O8+d superconductors with the similar Tc~70 K, Journal of Challenges and Mechanics, 5, 1-16, 20180601
  12. ★, Multilayered cuprate superconductor Ba2Ca5Cu6O12(O1-x,F-x)(2) studied by temperature-dependent scanning tunneling microscopy and spectroscopy, PHYSICAL REVIEW B, 95(17), 174508-1-174508-11, 20170516
  13. Observation of local magnetic distribution in ramp-edge Josephson junctions, JOURNAL OF PHYSICS COMMUNICATIONS, 1(2), 20170926
  14. Interplay between hybridization gaps and antiferromagnetic gap in the hole-doped Kondo semiconductor Ce(Os 1-y Rey)2Al10, Journal of Physics: Conference Series, 807, 012008-1-012008-6, 20170401
  15. Doping effects on the hybridization gap and antiferromagnetic order in the Kondo semiconductor CeOs2Al10 studied by break-junction experiments, PHYSICAL REVIEW B, 95(3), 20170125
  16. Scanning Tunnelling Microscopy and Spectroscopy of the Layered Nitride Superconductor alpha -NaxTiNCl, Physics Procedia, 81, 73-76, 20160401
  17. Hybridization gaps and antiferromagnetic gap in the Kondo semiconductors CeT2Al10 (T = Fe and Os) observed by break- junction tunneling spectroscopy, Physical Review B, 92(20), 201113(R)/1-5, 20151124
  18. Break-junction tunneling spectroscopy of superconducting FeSexTe1-x, Physics Procedia, 65, 65-68, 20150701
  19. The spatial distributions of large gap-like structure on Fe(Se,Te) single crystals observed by STM/STS, Physica C, 518, 23-27, 20150501
  20. ★, Variable electronic stripe structures of the parent iron-chalcogenide superconductor Fe1+dTe observed by STM-STS, Physical Review B, 90, 224503/1-8, 20141201
  21. Observation of the gap distribution on multi-layered cuprate superconductor Ba2Ca4Cu5O10(O1-x,Fx)2 by STM/STS, Physics Procedia, 58, 78-81, 20141101
  22. Tunneling STM/STS and break-junction spectroscopy of the layered superconductors beta-MNCl (M = Hf or Zr), Journal of Physics: Conference Series, 507, 012010/1-5, 20140501
  23. Tunneling spectra of break junctions involving Nb3Sn, Low Temperature Physics, 40, 1182-1186, 20140801
  24. Dynamics and mechanism of oxygen annealing in Fe1+yTe0.6Se0.4 single crystal, Scientific Reports, 4, 4585/1-7, 20140403
  25. Superconducting beta-ZrNClx probed by scanning-tunnelling and break-junction spectroscopy, Physica C, 494, 89-94, 20130601
  26. Nano-scale stripe structures on FeTe observed by low temperature STM/STS, Physics Procedia, 45, 85-88, 20130501
  27. Scanning-tunneling microscopy/spectroscopy and break-junction tunneling spectroscopy of FeSe1-xTex, Low Temperature Physics, 39, 343-353, 20130301
  28. Tunneling break-junction measurements of the superconducting gap in Y2C3, Physica C, 484, 52-55, 20130101
  29. Scanning-tunneling microscopy and break-junction spectroscopy on the superconducting Fe(Se, Te) single crystal, Physica C, 484, 22-26, 20130101
  30. STM/STS Observation on Layered Nitride Superconductor alpha-(DDA)xTiNCl, Journal of Physics: Conference Series, 400, 022112/1-4, 20121201
  31. Nanoscale electronic structure of the layered nitride superconductors alpha-KxTiNCl and beta-HfNCly observed by scanning tunneling microscopy and spectroscopy, Physical Review B, 85, 144517/1-7, 20120417
  32. Atomic surface structures on multi-layered cuprate superconductor Ba2Ca4Cu5O10(O1-xFx)(2) observed by STM, Physica C, 471, 698-700, 20111101
  33. Scanning tunneling microscopy on iron-chalcogenide superconductor Fe(Se, Te) single crystal, Physica C, 471, 622-624, 20111101
  34. STM/STS measurements of the layered superconductor beta-HfNCl1-x, Physica C, 470, S725-S727, 20101201
  35. Tunneling break-junction spectroscopy on the superconductor NdFeAs(O0.9F0.1), Physica C, 470, S358-S359, 20101201
  36. Atomic-scale spot structures and gap distributions on apical-fluorine cuprate superconductor Ba2Ca5Cu6O12 (O1-x, F-x)(2) observed by STM/STS, Physica C, 470, S160-S162, 20101201
  37. Scanning Tunneling Spectroscopy and Break Junction Spectroscopy on Iron-Oxypnictide Superconductor NdFeAs(O0.9 F0.1), Physica C, 470, 1070-1072, 20101101
  38. Tunneling spectroscopy of layered superconductors: intercalated Li-0.48(C4H8O)(x)HfNCl and De-intercalated HfNCl0.7, European Physical Journal B, 73(4), 471-482, 20100127
  39. Scanning Tunneling Microscopy/Spectroscopy on Multi-Layered Cuprate Superconductor Ba2Ca5Cu6O12(O1-xFx)2, Physica C, 469, 1020-1023, 20090601
  40. Semiconducting gap of Nd1.85Ce0.15CuO4 revealed by break junction tunneling spectroscopy, Journal of Physics: Conference Series, 150, 052046/1-4, 20090401
  41. STM Observation on Layered Nitride Superconductor KxTiNCl, Journal of Physics: Conference Series, 150, 052251/1-4, 20090401
  42. 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, 043705/1-4, 20080401
  43. Observation of local barrier height and electronic structure on cuprate superconductor by STM/STS, Journal of Physics Conference Series, 100, 052003/1-4, 20080301
  44. Specific heat and Tunneling Spectroscopy study of NbB2 with maximum T-c similar to 10K, Journal of the Physical Society of Japan, 76, 094705/1-5, 20070901
  45. Influence of Energy Dependent Quasiparticle Lifetime Effect on Tunneling Spectra of High-T_c Superconductors, The AIP Conference Proceedings, 850, 523-524, 20061201
  46. Electronic inhomogeneity as a function of out-of-plane disorder in Ln-doped Bi2201 superconductors, The AIP Conference Proceedings, 850, 507-508, 20061201
  47. Influence of the quasiparticle lifetime effect on local tunneling spectra of high-Tc superconductors, Physica C, 445, 146-149, 20061001
  48. Enhancement of Electronic Inhomogeneity Due to the Out-of-Plane Disorder in Bi2Sr2CuO6+d Superconductors Observed by Scanning Tunneling Microscopy/Spectroscopy, Physical Review B, 74, 094503/1-5, 20060914
  49. Images of interlayer vortices and c-axis penetration depth of high-Tc YBa2Cu3O7-y superconductor, Physical Review B, 73, 224519/1-5, 20060622
  50. Correlation between modulation structure and electronic inhomogeneity on Pb doped Bi2212 single crystals, Physica C, 426, 390-395, 20050701
  51. STM/STS observations of Pb-doped Bi-2212 single crystals, Physica C, 412, 270-274, 20040501
  52. Meissner state of high-Tc oxide thin films observed by scanning superconducting quantum interference device microscopy, Applied Physics Letters, 83, 2193-2195, 20030901
  53. Quantized vortices and diamagnetic precursor to the Meissner state in high-Tc superconductors, Journal of Low Temperature Physics, 131, 451-460, 20030501
  54. Fractional Quantized Vortices as Direct Evidence of dx2-y2-Wave Pairing Symmetry up to Critical Temperature in High-Tc Cuprate Superconductors, Japanese Journal of Applied Physics (Express Letter), 41, L739-L741, 20020701
  55. Diamagnetic precursor state in High-Tc Oxide Superconductors near Optimal Doping Using Scanning Superconducting Quantum Interference Device Microscopy, Japanese Journal of Applied Physics (Express Letter), 41, L497-L499, 20020501
  56. Temperature dependence of half flux quantum in YBa2Cu3O7-y tricrystal thin film observed by scanning SQUID microscopy, Physica C, 367, 28-32, 20020215
  57. Observation of Diamagnetic Precursor to Meissner State above Tc in High-Tc La2-xSrxCuO4 Cuprates by Scanning SQUID Microscopy, Physica C, 367, 9-14, 20020215
  58. Trapping state of quantized vortices in high-Tc YBa2Cu3O7-y thin films observed by scanning SQUID microscope, Physica C, 357, 1478-1482, 20010801
  59. Evaluation of supercurrent distribution in high-Tc superconductor by scanning SQUID microscopy, Physica C, 357, 1473-1477, 20010801
  60. Diamagnetic activity above Tc as a precursor to superconductivity in La2-xSrxCuO4 thin films, Nature, 412, 420-423, 20010701
  61. Observation of Fractional Vortices in High Tc Superconducting Thin Films by Scanning SQUID Microscope, Extended abstracts on 8th International Superconductive Electronics Conference (ISEC'01), 481, 20010622
  62. Supercurrent distribution in high-Tc superconducting YBa2Cu3O7-y thin films by scanning superconducting quantum interference device microscopy, Applied Physics Letters, 77, 3069-3071, 20001101
  63. Direct Observation of Vortex Structure in a High-Tc YBa2Cu3O7-y Thin film by Bitter Decoration Method, Journal of Low Temperature Physics, 117, 1347-1351, 19991101

Invited Lecture, Oral Presentation, Poster Presentation

  1. Scanning tunneling spectroscopy and break junction spectroscopy of the 2d layered nitride chloride superconductor alpha-TiNCl and the related materials, A. Sugimoto, K. Matsumoto, T. Saito, D. Yoshida, T. Ekino, M. Tanaka, A. M. Gabovich, IV International workshop on point-contact spectroscopy, 2024/03/27, With Invitation, English, B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, online
  2. Observation of zero-bias conductance peak above Tc at FeSe1-x Te x by break junction technique, Takeshi Saito, Akira Sugimoto, Toshikazu Ekino, Alexander M. Gabovich, IV International workshop on point-contact spectroscopy, 2024/03/27, With Invitation, English, B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, online
  3. Scanning Tunneling Microscopy and Spectroscopy of the 2D Layered Nitride Chloride superconductor alpha-TiNCl, Akira Sugimoto, Kaito Matsumoto, Toshikazu Ekino, Masashi Tanaka, Alexander M. Gabovich, 7th International Conference on Advances in Functional Materials (AFM2023), 2023/01/12, Without Invitation, English
  4. Electron tunneling and properties of break-junction interfaces in cuprates and related materials, Toshikazu Ekino, Akira Sugimoto, Hironori Ohtsubo, Kaito Matsumoto, Takeshi Saito, Masatoshi Iwano, Ryuichi Ukita, Jun Akimitsu, Alexander M. Gabovich, 7th International Conference on Advances in Functional Materials (AFM2023), 2023/01/11, Without Invitation, English
  5. Scanning tunneling spectroscopy and break junction spectroscopy on the impurity transition-metal doped iron 11 superconductors, Takeshi Saito, Hironori Ohtubo, Akira Sugimoto, Toshikazu Ekino, Alexander M. Gabovich, 7th International Conference on Advances in Functional Materials (AFM2023), 2023/01/11, Without Invitation, Japanese
  6. Nano-scale Periodic Modulations on Layered Nitride Chloride Superconductor alpha-TiNCl observed by STM/STS, Kaito Matsumoto, Akira Sugimoto, Ekino Toshikazu, Masashi Tanaka, Alexander M Gabovich, 29th International Conference on LOW TEMPERATURE PHYSICS (LT29), 2022/08/20, Without Invitation, English
  7. Tunneling spectroscopy (STM/STS and Break Junction) of the local density of states on Dilute-impurity-doped iron-11 superconductors, T. Saito, H. Ohtsubo, K. Matsumoto, S. Ishimitsu, A. Sugimoto and T. Ekino, 2022/03/15, Without Invitation, Japanese
  8. Tunneling spectroscopy (STM/STS and break junction) of a-NaxTiNCl and pristine materials (III), Kaito Matsumoto, Akira Sugimoto, Masashi Tanaka, Toshikazu Ekino, 2022/03/15, Without Invitation, Japanese
  9. Study of an iron superconductor related material CuFe (Se, Te) 2 by STM/STS and break-junction tunneling, Hironori Ohtsubo, Akira Sugimoto, Toshikazu Ekino, 2022/03/15, Without Invitation, Japanese
  10. Variation of Tc and STM/STS observation of the local density of states on Dilute-impurity-doped iron-11 superconductors, Takeshi Saito, Hironori Ohtsubo, Kaito Matsumoto, Satoru Ishimitsu, Akira Sugimoto, Toshikazu Ekino, 2021/07/31, Without Invitation, Japanese
  11. Measurements of tunneling spectroscopy (STM/STS and Break Junction) on alpha-Na_x TiNCl and pristine materials (II), Kaito Matsumoto, Akira Sugimoto, Masashi Tanaka, Toshikazu Ekino, 2021/09/20, Without Invitation, Japanese
  12. Observation of iron 11-based superconductors and related materials CuFe (Se, Te) 2 by STM/STS and low-temperature cleavage (BJ) method, Hironori Ohtsubo, Akira Sugimoto, Toshikazu Ekino, 2021/09/20, Without Invitation, Japanese
  13. STM/STS study of the local density of states in Cu doped Fe(Se,Te) superconductors, Akira Sugimoto, Satoru Ishimitsu, Hironori Ohtsubo, Kaito Matsumoto, Takeshi Saito, Toshikazu Ekino, Alexander M. Gabovich, The 34th International Symposium on Superconductivity (ISS2021), 2021/12/01, Without Invitation, English
  14. Variation of Tc and spatial modulations of density of state on impurity doped Mx-Fe(SeTe) observed by STM/STS (III), Akira Sugimoto, Hironori Ohtsubo, Kaito Matsumoto, Takeshi Saito, Satoru Ishimitsu, Toshikazu Ekino, 2021/09/20, Without Invitation, Japanese
  15. The combined study of STM/STS and break junction tunneling spectroscopy of Pb doped Bi2223 superconductors, 2021/03/13, Without Invitation, Japanese
  16. STM / STS observation of iron 11-based superconductor-related material, 2021/03/12, Without Invitation, Japanese
  17. Measurements of the local density of states by low temperature scanning tunneling microscopy/spectroscopy (STM/STS) on alpha-Ax-TiNCl and related materials, 2021/03/12, Without Invitation, Japanese
  18. Tunneling STM/STS and break-junction spectroscopy of the Pb-doped Bi2223 superconductor, Akira Sugimoto, Hironori Ohtsubo, Kaito Matsumoto, Satoru Ishimitsu, Masatoshi Iwano, Toshikazu Ekino, Alexander M. Gabovich, The 33rd International Symposium on Superconductivity (ISS2020), 2020/12/02, Without Invitation, English
  19. Density of states measurement on the layered nitride chloride superconductor Ax-TiNCl(A=Na), Kaito Matsumoto, Akira Sugimoto, Masashi Tanaka, Toshikazu Ekino, 2020/08/02, Without Invitation, Japanese
  20. Single crystal preparation and STM/STS observation of iron-11 series superconductor-related material (Cu,Fe)Se0.4Te0.6, Hironori Ohtsubo, Akira Sugimoto, Toshikazu Ekino, 2020/08/02, Without Invitation, Japanese
  21. STM/STS observation of the local density of states in the vicinity of the impurity of M_x_Fe(SeTe) (M=Cu, Zn, Zn) superconductors, Satoru Ishimitsu, Akira Sugimoto, Toshikazu Ekino, 2020/03/18, Without Invitation, Japanese
  22. Nano-scale periodic structures and gap distribution on Pb-doped Bi2223 cuprate superconductors observed by STM/STS, Akira Sugimoto, Satoru Ishimitsu, Masatoshi Iwano, Toshikazu Ekino, 2020/03/18, Without Invitation, Japanese
  23. STM/STS observations on Kondo semiconductor CeOs2Al10, Akira Sugimoto, Toshikazu Ekino, Jo Kawabata, Toshiro Takabatake, SCES2019 (International Conference of Strongly Correlated Electron Systems 2019), 2019/09/18, Without Invitation, English
  24. Spatial modulations on Cu doped Fe(SeTe) observed by STM/STS(II), Akira Sugimoto, Satoshi Ishimitsu, Toshikazu Ekino, 2019/09/11, Without Invitation, Japanese
  25. Bias-voltage dependences of the peak structures on the impurity-doped Fe(SeTe) Superconductors observed by STM/STS, Satoru Ishimitsu, Akira Sugimoto, Toshikazu Ekino, 2019/09/11, Without Invitation, Japanese
  26. Doping dependence of the impurity peaks on Cu-doped Fe(Se,Te) superconductors observed by STM/STS, Satoru Ishimitsu, Akira Sugimoto, Toshikazu Ekino, 2019/03/15, Without Invitation, Japanese
  27. Spatial modulations on Cu doped Fe(SeTe) observed by STM/STS, Akira Sugimoto, Satoru Ishimitsu, Toshikazu Ekino, 2019/03/14, Without Invitation, Japanese
  28. STM/STS Observation on Cu-doped Fe(SeTe) Superconductors, Satoru Ishimitu, Akira Sugimoto, Toshikazu Ekino, JPS autumn meeting (2018), 2018/09/10, Without Invitation, Japanese
  29. STM/STS observation of the ladder-type compound Sr 14-x Ca x Cu 24 O 41 (III), Masatoshi Iwano, Akira Sugimoto, Jun Akimitsu, Toshikazu Ekino, 73 th. JPS meeting (2018), 2018/03/23, Without Invitation, Japanese
  30. STM/STM observations on Kondo Semiconductor CeOs2Al10, Akira Sugimoto, Jo Kawabata, Toshiro Takabatake, Toshikazu Ekino, 73th JPS meeting (2018), 2018/03/23, Without Invitation, Japanese
  31. Nanoscale investigations of the MgB2 Superconductor by STM/STS, Akira Sugimoto, Yuta Yanase, Takahiro Muranaka, Toshikazu Ekino, 30 th INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS2017), 2017/12/13, Without Invitation, English
  32. Temperature dependence of the gaps on the 5- and 6- layered apical-F cuprate superconductors (F0245 and F0256) observed by STM/STS, Akira Sugimoto, Shunsuke Isono, Ryotaro Sekine, Kazuyasu Tokiwa, Toshikazu Ekino, 2017/09/23, Without Invitation, Japanese
  33. STM/STS observations of the gap distributions and atomic images on PbBi2223 polycrystalline superconductors, Akira Sugimoto, Masatoshi Iwano, Satoshi Ishimitsu, Toshikazu Ekino, 2017/09/06, Without Invitation, Japanese

Social Activities

History as Peer Reviews of Academic Papers

  1. 2023, Superconductor Science and Technology, Others
  2. 2023, MethodsX, Others
  3. 2022, Physics Letters A, Others, 1
  4. 2022, Superconductivity, Others, 1