Takumi Hasegawa

Last Updated :2025/03/03

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Associate Professor
E-mail
hasehiroshima-u.ac.jp

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

  • rattling
  • electron-lattice interaction
  • anharmonicity

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, 4Term, Experimental Methods and Laboratory Work in Physics II
  4. 2024, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Physics II
  5. 2024, Undergraduate Education, 3Term, English for the Physical Science
  6. 2024, Undergraduate Education, First Semester, Fundamental Laboratory Work in Physics
  7. 2024, Undergraduate Education, First Semester, Basic Experimental Methods for Physics
  8. 2024, Undergraduate Education, 1Term, Introduction to Physical Sciences
  9. 2024, Undergraduate Education, 3Term, Laboratory Work in Material Sciences A
  10. 2024, Undergraduate Education, 3Term, Experimental Methods for Materials Sciencs A
  11. 2024, Undergraduate Education, 2Term, Laboratory Work in Material Sciences D
  12. 2024, Undergraduate Education, 2Term, Experimental Methods for Materials Sciencs D
  13. 2024, Undergraduate Education, 4Term, Solid State Physics I
  14. 2024, Undergraduate Education, 2Term, Frontiers of Material Science
  15. 2024, Graduate Education (Master's Program) , 2Term, Seminar in Integrated Arts and Sciences
  16. 2024, Graduate Education (Master's Program) , 3Term, Transdisciplinary Science and Engineering Program Common Subjects 1 (Smart Development)
  17. 2024, Graduate Education (Master's Program) , 3Term, Correlated Materials Science

Research Activities

Academic Papers

  1. Insulating Nature of Iridium Oxide Ca5Ir3O12 Probed by Synchrotron-Radiation-Based Infrared Spectroscopy, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 92(6), 20230524
    Link to Paper Search Results by DOI
  2. Space-Group Determination of Superlattice Structure Due to Electric Toroidal Ordering in Ca5Ir3O12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 92(6), 20230516
    Link to Paper Search Results by DOI
  3. Phonon dispersion curves in the type-I crystalline and molten clathrate compound Eu8Ga16Ge30, JOURNAL OF PHYSICS-CONDENSED MATTER, 35(11), 20230322
    Link to Paper Search Results by DOI
  4. Investigation of the phonon dispersion associated with superlattice reflections in the BiS2-based superconductor LaBiS2O0.5F0.5, PHYSICAL REVIEW B, 107(2), 20230101
    Link to Paper Search Results by DOI
  5. Ab initio derivation of low-energy Hamiltonians for systems with strong spin-orbit interaction: Application to Ca5Ir3O12, PHYSICAL REVIEW B, 104(7), 20210826
    Link to Paper Search Results by DOI
  6. Inelastic X-ray Scattering Investigation of Proper Ferroelastic Transition in LiNH4C4H4O6 center dot H2O, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85(1), 2016
  7. Origins of Phase Transitions in Valence Fluctuating YbPd, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 82(8), 2013
  8. Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites ROs4Sb12 (R = light rare-earth), PHYSICAL REVIEW B, 86(19), 2012
  9. Nearly Room-Temperature Ferromagnetism in a Pressure-Induced Correlated Metallic State of the van der Waals Insulator CrGeTe3, PHYSICAL REVIEW LETTERS, 127(21), 2021
  10. Renormalized Motion of Dysprosium Atoms Filling Boron Cages of DyB6, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81(11), 2012
  11. Transverse-type Lattice Modulation in LaO0.5F0.5BiS2: Possible Charge Density Wave Formation, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(10), 2021
  12. Retreat from Stress: Rattling in a Planar Coordination, ADVANCED MATERIALS, 30(13), 2018
  13. High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7, PHYSICA B-CONDENSED MATTER, 536, 600-603, 2018
  14. Spin-gap formation due to spin-Peierls instability in pi-orbital-ordered NaO2, PHYSICAL REVIEW B, 104(14), 2021
  15. Antiferroelectric distortion with anomalous phonon softening in the excitonic insulator Ta2NiSe5, PHYSICAL REVIEW B, 98(4), 2018
  16. Soft-phonon driven hexagonal-orthorhombic phase transition in BaVS3, PHYSICAL REVIEW B, 99(14), 2019
  17. Successive Continuous Phase Transitions in Spin-Orbit Coupled Metal Cd2Re2O7, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(6), 2021
  18. First-Order Metal-Semiconductor Transition Triggered by Rattling Transition in Tetrahedrite Cu12Sb4S13: Cu-Nuclear Magnetic Resonance Studies, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 88(5), 2019
  19. Intercalated Cu+ ion dynamics in the two-dimensional layered compound Cu0.33TiSe2, PHYSICAL REVIEW B, 101(9), 2020
  20. Study of Phonon Dispersion of Iridium Oxide Ca5Ir3O12 with Strong Spin-Orbit Interaction, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 89(5), 2020
  21. First Observation of Superlattice Reflections in the Hidden Order at 105 K of Spin-Orbit Coupled Iridium Oxide Ca5Ir3O12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(6), 2021
  22. Raman Scattering Investigation of Structural Transition in Ca5Ir3O12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 89(5), 2020
  23. Regular-triangle trimer and charge order preserving the Anderson condition in the pyrochlore structure of CsW2O6, NATURE COMMUNICATIONS, 11(1), 2020
  24. Inelastic X-ray Scattering Study of the Cage-structured Compound PrRh2Zn20, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(2), 2021
  25. Lattice instability coupled with valence degrees of freedom in valence fluctuation compound YbPd, PHYSICAL REVIEW B, 102(24), 2020
  26. First-principles calculation of lattice dynamics of skutterudite compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77, 248-250, 2008
  27. Raman Scattering Study of Filled Skutterudite Compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77, 251-253, 2008
  28. Elastic properties of distorted triangular lattice KNiCl3-family compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 75(9), 2006
  29. Raman scattering in KOs2O6, PHYSICAL REVIEW B, 77(6), 2008
  30. Direct observation of low-energy Sm phonon in SmRu4P12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77(3), 2008
  31. Neutron Diffraction Study of Structural Intermediate Phase IV in TlCoCl3, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77(12), 2008
  32. Off-Center Guest Vibrations and Their Effect on Lattice Thermal Conductivity in n- and p-Type beta-Ba8Ga16Sn30, JOURNAL OF ELECTRONIC MATERIALS, 38(7), 1516-1520, 2009
  33. Lattice dynamical study of alkaline atom vibrations with anharmonic interactions in beta-pyrochlore oxides, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 470, S695-S696, 2010
  34. Raman Scattering Study of Nano-Particle BaTiO3, CHINESE JOURNAL OF PHYSICS, 49(1), 49-55, 2011
  35. Raman scattering of hydrogen storage material LiNH2, CHINESE JOURNAL OF PHYSICS, 49(1), 294-300, 2011
  36. Structural Transition of RhSb3 under High Pressures, CHINESE JOURNAL OF PHYSICS, 49(1), 323-330, 2011
  37. Raman Scattering Study of Hydrogen Storage Material LiNH2, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81(9), 2012
  38. Successive phase transitions of the spin-orbit-coupled metal Cd2Re2O7 probed by high-resolution synchrotron x-ray diffraction, JOURNAL OF PHYSICS-CONDENSED MATTER, 35(3), 20230125
    Link to Paper Search Results by DOI
  39. Do electron distributions with orbital degree of freedom exhibit anisotropy?, MATERIALS ADVANCES, 3(7), 3192-3198, 20220404
    Link to Paper Search Results by DOI
  40. Large diamagnetism and low-lying optical phonon modes in Pt-Cd gamma-phase, JOURNAL OF ALLOYS AND COMPOUNDS, 901, 20220425
    Link to Paper Search Results by DOI
  41. Raman spectroscopy on ternary transition metal chalcogenide Rb2Ni3S4, Journal of Alloys and Compounds, 364(1-2), 199-207, 20040211
  42. Ultrafast photo-induced metal-insulator transition in 1/4 filled organic crystal (EDO-TTF)2PF6, Journal of Physics: Conference Series, 21, 130-135, 20050301
  43. Gigantic Photoresponse in 1/4-Filled-Band Organic Salt (EDO-TTF)2PF6, Science, 307, 86-89, 20050107
  44. First-Principles Study of Structural Phase Transitions in Hexagonal KNiCl3, Journal of the Korean Physical Society, 46(1), 59-62, 20050101
  45. Elastic properties of distorted triangular lattice KNiCl3-family compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 75(9), 200609
    Link to Paper Search Results by DOI
  46. Raman scattering of Type-I clathrate compounds., Physica B, 383, 134-136, 20060401
  47. Raman scattering study of the guest ion motion in caged crystals., 33-35, 20061201
  48. Dynamical properties of guest ions in the type-I clathrate compounds X8Ga16Ge30 (X=Eu, Sr, Ba)investigated by Raman scattering, Phys. Rev. B, 74, 174303 (1-5), 20061101
  49. Raman scattering investigation of skutterudite compounds, Physica B, 383(1), 128-129, 20061201
  50. Lattice dynamics calculation of infrared active modes of cuprate superconductors, PHYSICA B-CONDENSED MATTER, 383(1), 86-88, 20060815
    Link to Paper Search Results by DOI
  51. Raman scattering investigation of skutterudite compounds, PHYSICA B-CONDENSED MATTER, 383(1), 128-129, 20060815
    Link to Paper Search Results by DOI
  52. Raman scattering of type-I clathrate compounds, PHYSICA B-CONDENSED MATTER, 383(1), 134-136, 20060815
    Link to Paper Search Results by DOI
  53. Dynamical properties of guest ions in the type-I clathrate compounds X8Ga16Ge30 (X=Eu,Sr,Ba) investigated by Raman scattering, PHYSICAL REVIEW B, 74(17), 200611
    Link to Paper Search Results by DOI
  54. Raman scattering study of the skutterudite compounds, Journal of Magnetism and Magnetic Materials, 310(2), 948-950, 20070401
  55. Raman scattering study of type-I clathrate compounds: A8Ga16Ge30 (A = Eu, Sr, Ba), Journal of Magnetism and Magnetic Materials, 310(2), 954-956, 20070401
  56. Raman scattering on La3Pd20X6 (X = Si, Ge), Journal of Magnetism and Magnetic Materials, 310(2), 984-986, 20070401
  57. Raman scattering study of filled skutterudite compounds, Journal of Physics: Conference Series, 92, 012123, 20071201
  58. Raman scattering on KOs2O6, Journal of Physics: Conference Series, 9, 012124, 20071201
  59. Raman scattering of type-I clathrate compounds: A8Ga16Ge30(A = Eu, Sr, Ba) and Sr8Ga16Si30-xGex, Journal of Physics: Conference Series, 92, 012171, 20071201
  60. Low-lying optical modes in filled skutterudites using inelastic x-ray scattering techniques, Journal of Physics: Conference Series, 92, 012171, 20071201
  61. Raman scattering study of the skutterudite compounds, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 310(2), 948-950, 200703
    Link to Paper Search Results by DOI
  62. Raman scattering study of type-I clathrate compounds: A(8)Ga(16)Ge(30) (A = Eu, Sr, Ba), JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 310(2), 954-956, 200703
    Link to Paper Search Results by DOI
  63. Raman scattering on La3Pd20X6 (X = Si, Ge), JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 310(2), 984-986, 200703
    Link to Paper Search Results by DOI
  64. Neutron Diffraction Study of Structural Intermediate Phase IV in TlCoCl3, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77(12), 200812
    Link to Paper Search Results by DOI
  65. Raman Scattering Study of Guest Ion Motion in Cage Compounds, Journal of Physical Society of Japan, 77(SUPPLMENT), 142-147, 20080301
  66. First-priciples calculation of lattice dynamics of skutterudite compounds, 77(SUPPLEMENT), 248-250, 20080301
  67. Raman scattering of type-I clathrate compounds, 77(SUPPLEMENT), 254-256, 20080301
  68. Direct Observation of Low-Energy Sm Phonon in SmRu4P12, 77(3), 033601/4 PAGES, 20080301
  69. Raman scattering of KOs2O6, Physical Review B, 77(6), 064303/ 6 PAGES, 20080315
  70. Anomalous phonon properties in the silicide superconductor CaAlSi and SrAlSi, Physical Review B, 78(18), 184303/10 PAGES, 20081101
  71. Off-center rattling and anisotropic expansion of type-I clathrates studied by Raman scattering, PHYSICAL REVIEW LETTERS, 100(16), 20080425
    Link to Paper Search Results by DOI
  72. Off-Center Guest Vibrations and Their Effect on Lattice Thermal Conductivity in n- and p-Type beta-Ba8Ga16Sn30, JOURNAL OF ELECTRONIC MATERIALS, 38(7), 1516-1520, 200907
    Link to Paper Search Results by DOI
  73. Optical conductivity of rattling phonons in type-I clathrate Ba8Ga16Ge30, PHYSICAL REVIEW B, 79(21), 200906
    Link to Paper Search Results by DOI
  74. Raman scattering investigation of beta-pyrochlore osmium oxides, AOs2O6 (A=K, Rb, and Cs), Journal of Physics: Conference Series, 150, 052067, 20090401
  75. Crystal Field Excitations of Filled Skutterudite PrRu4P12 by Raman Scattering, Journal of Physics: Conference Series, 150, 042147, 20090401
  76. Valence dependence of interatomic interactions in RB6, Journal of Physics: Conference Series, 176, 0120131, 20090701
  77. Raman scattering of rare earth hexaborides, Journal of Physics: Conference Series, 176, 012032, 20090701
  78. 149Sm nuclear resonant inelastic scattering of SmB6, Journal of Physics: Conference Series, 176, 012033, 20090701
  79. Off-center rattling and cage vibration of the carrier-tuned type-I clathrate Ba8Ga16Ge30 studied by Raman scattering, PHYSICAL REVIEW B, 82(13), 20101005
    Link to Paper Search Results by DOI
  80. Lattice dynamical study of alkaline atom vibrations with anharmonic interactions in beta-pyrochlore oxides, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 470, S695-S696, 201012
    Link to Paper Search Results by DOI
  81. Raman scattering study in iridium pyrochlore oxides, Journal of Physics: Conference Series, 200, 012054, 20100201
  82. Off-center rattling modes and glasslike thermal conductivity in the type-I clathrate Ba8Ga16Sn30, Physical Review B, 81(20), 205207, 20100501
  83. Raman scattering study of nano-particle BaTiO3, Chinese Journal of Physics, 49(1), 49-55, 20110201
  84. Raman scattering of hydrogen storage material LiNH2, Chinese Journal of Physics, 49(1), 294-300, 20110201
  85. Structural transition of RhSb3 under high pressures, Chinese Journal of Physics, 49(1), 323-330, 20110201
  86. Raman spectral analysis of metal-insulator transitions in skutterudite compound PrRu4P12, Chinese Journal of Physics, 49(1), 471-479, 20110201
  87. Low temperature phase of YbPd investigated by Raman scattering, Journal of Physics: Conference Series, 273(1), 012030/1-012030/4, 20110201
  88. Raman Scattering of YB6, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80, 201107
  89. Raman scattering investigation on YbPd, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80, 201107
  90. Raman scattering study of lattice dynamics in caged compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80, 201107
  91. The anharmonic vibration of Li in lithium amide, APPLIED PHYSICS LETTERS, 100(15), 20120409
    Link to Paper Search Results by DOI
  92. Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd2Os2O7, PHYSICAL REVIEW LETTERS, 108(24), 20120613
    Link to Paper Search Results by DOI
  93. Raman Scattering Study of Hydrogen Storage Material LiNH2, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81(9), 201209
    Link to Paper Search Results by DOI
  94. Renormalized Motion of Dysprosium Atoms Filling Boron Cages of DyB6, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81(11), 201211
    Link to Paper Search Results by DOI
  95. Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites ROs4Sb12 (R = light rare-earth), PHYSICAL REVIEW B, 86(19), 20121112
    Link to Paper Search Results by DOI
  96. Origins of Phase Transitions in Valence Fluctuating YbPd, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 82(8), 201308
    Link to Paper Search Results by DOI
  97. First-principles calculations of lattice vibrations on LaT2Zn20 (T = Ru and Ir), Journal of Physics: Conference Series, 391, 012016, 20130101
  98. Raman scattering spectra of LaRu2Al10 and CeRu2Al10, Journal of Physics: Conference Series, 391, 012050, 20130101
  99. Crystal Electric Field Study in Pr(Os1-xRux)4Sb12 by Raman Scattering, JPS Conf. Proc., 3, 015040/1-015040/6, 20140616
  100. Measurement of Crystal Field Excitations in NdT2Al10 (T=Ru and Os) by Raman Scattering, JPS Conf. Proc., 3, 011070/1-011070/6, 20140616
  101. Atomic Dynamics and Structural Transitions in Caged Compounds RRu2Zn20 (R=La and Pr), JPS Conf. Proc., 3, 011068/1-011068/5, 20140616
  102. Inelastic X-ray Scattering of Valence Fluctuating YbPd, JPS Conf. Proc., 3, 011037/1-011037/5, 20140616
  103. Interplay between low-energy optical phonon modes and structural transition in PrT2Zn20 (T=Ru and Ir), Journal of Physics: Conference Series, 592, 012024/1-012024/6, 20150325
  104. Valence-lattice interaction on YbPd, Journal of Physics: Conference Series, 592, 012061/1-012061/6, 20150325
  105. Inelastic X-ray Scattering Investigation of Proper Ferroelastic Transition in LiNH4C4H4O6 center dot H2O, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85(1), 20160115
    Link to Paper Search Results by DOI
  106. Low-energy optical phonon modes in the caged compound LaRu2Zn20, PHYSICAL REVIEW B, 93(6), 20160209
    Link to Paper Search Results by DOI
  107. Guest Ion Motion in Cage Structure Crystals Investigated by Raman Scattering, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77, 142-147, 2008
  108. Raman Scattering of Type-I Clathrate Compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77, 254-256, 2008
  109. 15aXD-6 Raman scattering measurement of CoS_2, MnSi, and Sc_3In as itinerant electron magnet, Meeting abstracts of the Physical Society of Japan, 59(2), 20040825
  110. 27pXQ-4Raman scattering on (EDO-TTF)_2PF_6., Meeting abstracts of the Physical Society of Japan, 60(1), 20050304
  111. 22pWF-6 Raman scattering study of off-center rattling in type-I Ba_8Ga_<16>Sn_<30>, Meeting abstracts of the Physical Society of Japan, 63(2), 20080825
  112. 23pTH-8 Raman scattering of clathrate compounds Sr_8Ga_<16>Si<30-x>Ge_x II, Meeting abstracts of the Physical Society of Japan, 62(2), 20070821
  113. 28aPS-70 Inelastic X-ray scattering study of phonon dispersion in RT_2Zn_<20> (R=La, Pr, T=Ru, Ir), Meeting abstracts of the Physical Society of Japan, 69(1), 20140305
  114. Effect of rattling motion without cage structure on lattice thermal conductivity in LaOBiS2-xSex, APPLIED PHYSICS LETTERS, 112(2), 20180108
    Link to Paper Search Results by DOI
  115. Retreat from Stress: Rattling in a Planar Coordination, ADVANCED MATERIALS, 30(13), 20180327
    Link to Paper Search Results by DOI
  116. High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7, PHYSICA B-CONDENSED MATTER, 536, 600-603, 20180501
    Link to Paper Search Results by DOI
  117. Antiferroelectric distortion with anomalous phonon softening in the excitonic insulator Ta2NiSe5, PHYSICAL REVIEW B, 98(4), 20180730
    Link to Paper Search Results by DOI
  118. Soft-phonon driven hexagonal-orthorhombic phase transition in BaVS3, PHYSICAL REVIEW B, 99(14), 20190423
    Link to Paper Search Results by DOI
  119. First-Order Metal-Semiconductor Transition Triggered by Rattling Transition in Tetrahedrite Cu12Sb4S13: Cu-Nuclear Magnetic Resonance Studies, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 88(5), 20190515
    Link to Paper Search Results by DOI
  120. Intercalated Cu+ ion dynamics in the two-dimensional layered compound Cu0.33TiSe2, PHYSICAL REVIEW B, 101(9), 20200331
    Link to Paper Search Results by DOI
  121. Study of Phonon Dispersion of Iridium Oxide Ca5Ir3O12 with Strong Spin-Orbit Interaction, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 89(5), 20200515
    Link to Paper Search Results by DOI
  122. Raman Scattering Investigation of Structural Transition in Ca5Ir3O12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 89(5), 20200515
    Link to Paper Search Results by DOI
  123. Coexistence of odd-parity and even-parity order parameters in the multipole order phase of the spin-orbit coupled metal Cd2Re2O7, PHYSICAL REVIEW B, 101(20), 20200519
    Link to Paper Search Results by DOI
  124. Regular-triangle trimer and charge order preserving the Anderson condition in the pyrochlore structure of CsW2O6, NATURE COMMUNICATIONS, 11(1), 20200619
    Link to Paper Search Results by DOI
  125. Anomalous changes of electric quadrupole order at low temperatures in the spin-orbit coupled metal Cd2Re2O7, PHYSICAL REVIEW B, 102(15), 20201021
    Link to Paper Search Results by DOI
  126. Lattice instability coupled with valence degrees of freedom in valence fluctuation compound YbPd, PHYSICAL REVIEW B, 102(24), 20201230
    Link to Paper Search Results by DOI
  127. Inelastic X-ray Scattering Study of the Cage-structured Compound PrRh2Zn20, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(2), 20210215
    Link to Paper Search Results by DOI
  128. First Observation of Superlattice Reflections in the Hidden Order at 105 K of Spin-Orbit Coupled Iridium Oxide Ca5Ir3O12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(6), 20210615
    Link to Paper Search Results by DOI
  129. Successive Continuous Phase Transitions in Spin-Orbit Coupled Metal Cd2Re2O7, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(6), 20210615
    Link to Paper Search Results by DOI
  130. Zn-Substitution Effect on Metal-Semiconductor Transition in Tetrahedrite Cu12Sb4S13, JPS Conference Proceedings, 29, 013008, 20190925
  131. Precursor of Metal-Semiconductor Transition in Tetrahedrite Probed by Cu-NMR, JPS Conference Proceedings, 30, 011075, 20190917

Invited Lecture, Oral Presentation, Poster Presentation

  1. Bond strength in ammonia borane and its related materials, Takumi Hasegawa, Tessui Nakagawa, Troy A. Semelsberger, Benjamin L. Davis, Rico E. Del Sesto, Anthony K. Burrell, Ogita Norio, and Masayuki Udagawa, The 10th Japan-Korea Conference on Ferroelectrics, 2014/08/17, Without Invitation, English, Hiroshima, Japan
    Related URL
  2. Raman scattering investigation on ammonia borane and amidoborane compounds, Takumi Hasegawa, Tessui Nakagawa, Troy A. Semelsberger, Benjamin L. Davis, Rico E. Del Sesto, Anthony K. Burrell, Ogita Norio, and Masayuki Udagawa, The International Meeting on Advanced Material Science for Hydrogen, 2014/08/25, Without Invitation, English, Okinawa, Japan
  3. First-principles calculation of phonon dispersion on Cu12Sb4S13, Takumi Hasegawa, K. Suekuni, H. I. Tanaka, T. Takabatake, N. Ogita, and M. Udagawa, 2015/09/16, Without Invitation, Japanese
  4. First-principles calculation of anharmonicity on LaRu4Sb12 and LaOs4Sb12, T. Hasegawa, N. Ogita, and M. Udagawa, 2015/03/21, Without Invitation, Japanese
  5. Incident-wavelength dependence of Raman spectra on LaB6, T. Hasegawa, N. Ogita, and M. Udagawa, 2014/09/07, Without Invitation, Japanese
  6. Valence-phonon interaction and structural transitions in YbPd, T. Hasegawa, N. Ogita, A. Mitsuda, M. Sugishima, H. Wada, S. Tsutsui, A. Q. R. Baron, M. Udagawa, 2014/03/27, Without Invitation, Japanese
  7. First principles calculation of lattice dyncamics on LaT2Zn20 (T=Ru,Ir), T. Hasegawa, N. Ogita, M. Udagawa, 2013/09/25, Without Invitation, Japanese
  8. Raman scattering on MnP, T. Hasegawa, N. Ogita, M. Udagawa, S. Yano, Y. Kousaka, J. Akimitsu, 2013/03/26, Without Invitation, Japanese
  9. Measurement of Crystal Field Excitations in NdT2Al10 (T = Ru and Os) by Raman Scattering, T. Hasegawa, K. Nagano, N. Ogita, M. Udagawa, H. Tanida, D. Tanaka, M.Sera, T. Nishioka, M. Matsumura, The International Conference on Strongly Correlated Electron Systems, SCES2013, 2013/08/05, Without Invitation, English, Tokyo, Japan
    Related URL
  10. Investigation of low-temperature structure and anharmonic interactions on Tetrahedrites Cu12X4S13 (X = As, Sb) by first-principles calculation, Takumi Hasegawa, Norio Ogita, Masayuki Udagawa, The 2016 Autumn Meeting of JPS, 2016/09/13, Without Invitation, Japanese, The Physical Society of Japan, Kanazawa University
  11. Analysis of anharmonicity on tetrahedrites Cu12X4S13 (X=Sb and As), Takumi Haseagwa, ECMP2018, 2018/03/05, With Invitation, English, Akio Kimura, Higashi-Hiroshima, Hiroshima, Japan
    Related URL
  12. Review of the results on order parameters of Cd2Re2O7, Takumi Hasegawa, 2018/08/08, With Invitation, Japanese
  13. Raman scattering investigation on geometrically frustrated iridate Ca5Ir3O12, T. Hasegawa, N. Ogita, W. Yoshida, K. Nakamura, and K. Matsuhira, Emergence Condensed-Matter Physics 2019, 2019/03/19, Without Invitation, English, Higashi-Hiroshima, Hiroshima, Japan
  14. Raman scattering investigation on geometrically frustrated iridate Ca5Ir3O12, T. Hasegawa, W. Yoshida, K. Nakamura, N. Ogita, K. Matsuhira, Frontiers of Correlated Electron Sciences 2019, 2019/05/29, Without Invitation, English, Tokyo University, Tokyo, Japan

Awards

  1. 2105/01, JPSJ Papers of Editors' Choice, The Physical Society of Japan, First Observation of Superlattice Reflections in the Hidden Order at 105 K of Spin-Orbit Coupled Iridium Oxide Ca5Ir3O12

External Funds

Acceptance Results of Competitive Funds

  1. KAKENHI, Study on the mechanism of metal-insulator transition in the pyrochlore iridates, 2011, 2013
    Permalink
  2. KAKENHI, Investigation of Alkaline metal vibration effect on the electric states in β-pyrochlore oxides, 2009, 2010
    Permalink