Takumi Hasegawa

Last Updated :2025/07/14

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. 2025, Liberal Arts Education Program1, 3Term, Experimental Methods and Laboratory Work in Physics I
  2. 2025, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Physics I
  3. 2025, Liberal Arts Education Program1, 4Term, Experimental Methods and Laboratory Work in Physics II
  4. 2025, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Physics II
  5. 2025, Undergraduate Education, 3Term, English for the Physical Science
  6. 2025, Undergraduate Education, First Semester, Fundamental Laboratory Work in Physics
  7. 2025, Undergraduate Education, First Semester, Basic Experimental Methods for Physics
  8. 2025, Undergraduate Education, 1Term, Introduction to Physical Sciences
  9. 2025, Undergraduate Education, 3Term, Laboratory Work in Material Sciences A
  10. 2025, Undergraduate Education, 3Term, Experimental Methods for Materials Sciencs A
  11. 2025, Undergraduate Education, 2Term, Laboratory Work in Material Sciences D
  12. 2025, Undergraduate Education, 2Term, Experimental Methods for Materials Sciencs D
  13. 2025, Undergraduate Education, 4Term, Solid State Physics I
  14. 2025, Undergraduate Education, 2Term, Frontiers of Material Science
  15. 2025, Graduate Education (Master's Program) , 3Term, Transdisciplinary Science and Engineering Program Common Subjects 1 (Smart Development)
  16. 2025, Graduate Education (Master's Program) , 3Term, Correlated Materials Science

Research Activities

Academic Papers

  1. Effect of regeneration temperatures on conversion efficiency of an ortho-to-parahydrogen catalyst, CRYOGENICS, 150, 20250915
    Link to Paper Search Results by DOI
  2. Observation of Current-Induced Lattice Distortion in Spin-Orbit Coupled Iridium Oxide Ca5Ir3O12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 94(2), 20250215
    Link to Paper Search Results by DOI
  3. Electronic Origin of Enhanced Photocatalytic Activity at the Anatase/Rutile Boundary: A Case of Acetic Acid on the TiO2 Surface, JOURNAL OF PHYSICAL CHEMISTRY C, 128(51), 21767-21775, 20241202
    Link to Paper Search Results by DOI
  4. Observation of Temperature Hysteresis in Electrical Conductivity and Local Lattice Distortion Induced by Current in Iridate Ca5Ir3O12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 93(10), 20241015
    Link to Paper Search Results by DOI
  5. Enhanced Cryogenic Thermoelectricity in Semimetal Ta2PdSe6 through Non-Fermi Liquid-Like Charge and Heat Transport, ADVANCED PHYSICS RESEARCH, 3(11), 202411
    Link to Paper Search Results by DOI
  6. In-situ measurement of radiation driven back-conversion from para to ortho liquid hydrogen state in cold moderators at J-PARC, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 557, 202412
    Link to Paper Search Results by DOI
  7. Development of an in-situ ortho-to-parahydrogen fraction measurement system for the ESS cryogenic moderator system, CRYOGENICS, 139, 202404
    Link to Paper Search Results by DOI
  8. Linear Magnetoresistance and Type-I Superconductivity in β-IrSn4, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 93(4), 20240415
    Link to Paper Search Results by DOI
  9. Stabilization of Bi vibration along c-axis in BiS2-based layered compounds La(O,F)Bi(S,Se)2 by Se substitution, APPLIED PHYSICS EXPRESS, 17(1), 20240101
    Link to Paper Search Results by DOI
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. Inelastic X-ray Scattering Investigation of Proper Ferroelastic Transition in LiNH4C4H4O6 center dot H2O, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85(1), 2016
  16. Origins of Phase Transitions in Valence Fluctuating YbPd, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 82(8), 2013
  17. 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
  18. Nearly Room-Temperature Ferromagnetism in a Pressure-Induced Correlated Metallic State of the van der Waals Insulator CrGeTe3, PHYSICAL REVIEW LETTERS, 127(21), 2021
  19. Renormalized Motion of Dysprosium Atoms Filling Boron Cages of DyB6, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81(11), 2012
  20. Transverse-type Lattice Modulation in LaO0.5F0.5BiS2: Possible Charge Density Wave Formation, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(10), 2021
  21. Retreat from Stress: Rattling in a Planar Coordination, ADVANCED MATERIALS, 30(13), 2018
  22. High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7, PHYSICA B-CONDENSED MATTER, 536, 600-603, 2018
  23. Spin-gap formation due to spin-Peierls instability in pi-orbital-ordered NaO2, PHYSICAL REVIEW B, 104(14), 2021
  24. Antiferroelectric distortion with anomalous phonon softening in the excitonic insulator Ta2NiSe5, PHYSICAL REVIEW B, 98(4), 2018
  25. Soft-phonon driven hexagonal-orthorhombic phase transition in BaVS3, PHYSICAL REVIEW B, 99(14), 2019
  26. Successive Continuous Phase Transitions in Spin-Orbit Coupled Metal Cd2Re2O7, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(6), 2021
  27. 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
  28. Intercalated Cu+ ion dynamics in the two-dimensional layered compound Cu0.33TiSe2, PHYSICAL REVIEW B, 101(9), 2020
  29. Study of Phonon Dispersion of Iridium Oxide Ca5Ir3O12 with Strong Spin-Orbit Interaction, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 89(5), 2020
  30. 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
  31. Raman Scattering Investigation of Structural Transition in Ca5Ir3O12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 89(5), 2020
  32. Regular-triangle trimer and charge order preserving the Anderson condition in the pyrochlore structure of CsW2O6, NATURE COMMUNICATIONS, 11(1), 2020
  33. Inelastic X-ray Scattering Study of the Cage-structured Compound PrRh2Zn20, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(2), 2021
  34. Lattice instability coupled with valence degrees of freedom in valence fluctuation compound YbPd, PHYSICAL REVIEW B, 102(24), 2020
  35. First-principles calculation of lattice dynamics of skutterudite compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77, 248-250, 2008
  36. Raman Scattering Study of Filled Skutterudite Compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77, 251-253, 2008
  37. Elastic properties of distorted triangular lattice KNiCl3-family compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 75(9), 2006
  38. Raman scattering in KOs2O6, PHYSICAL REVIEW B, 77(6), 2008
  39. Direct observation of low-energy Sm phonon in SmRu4P12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77(3), 2008
  40. Neutron Diffraction Study of Structural Intermediate Phase IV in TlCoCl3, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77(12), 2008
  41. 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
  42. Lattice dynamical study of alkaline atom vibrations with anharmonic interactions in beta-pyrochlore oxides, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 470, S695-S696, 2010
  43. Raman Scattering Study of Nano-Particle BaTiO3, CHINESE JOURNAL OF PHYSICS, 49(1), 49-55, 2011
  44. Raman scattering of hydrogen storage material LiNH2, CHINESE JOURNAL OF PHYSICS, 49(1), 294-300, 2011
  45. Structural Transition of RhSb3 under High Pressures, CHINESE JOURNAL OF PHYSICS, 49(1), 323-330, 2011
  46. Raman Scattering Study of Hydrogen Storage Material LiNH2, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81(9), 2012
  47. 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
  48. Do electron distributions with orbital degree of freedom exhibit anisotropy?, MATERIALS ADVANCES, 3(7), 3192-3198, 20220404
    Link to Paper Search Results by DOI
  49. 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
  50. Raman spectroscopy on ternary transition metal chalcogenide Rb2Ni3S4, Journal of Alloys and Compounds, 364(1-2), 199-207, 20040211
  51. Ultrafast photo-induced metal-insulator transition in 1/4 filled organic crystal (EDO-TTF)2PF6, Journal of Physics: Conference Series, 21, 130-135, 20050301
  52. Gigantic Photoresponse in 1/4-Filled-Band Organic Salt (EDO-TTF)2PF6, Science, 307, 86-89, 20050107
  53. First-Principles Study of Structural Phase Transitions in Hexagonal KNiCl3, Journal of the Korean Physical Society, 46(1), 59-62, 20050101
  54. 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
  55. Raman scattering of Type-I clathrate compounds., Physica B, 383, 134-136, 20060401
  56. Raman scattering study of the guest ion motion in caged crystals., 33-35, 20061201
  57. 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
  58. Raman scattering investigation of skutterudite compounds, Physica B, 383(1), 128-129, 20061201
  59. 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
  60. Raman scattering investigation of skutterudite compounds, PHYSICA B-CONDENSED MATTER, 383(1), 128-129, 20060815
    Link to Paper Search Results by DOI
  61. Raman scattering of type-I clathrate compounds, PHYSICA B-CONDENSED MATTER, 383(1), 134-136, 20060815
    Link to Paper Search Results by DOI
  62. 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
  63. Raman scattering study of the skutterudite compounds, Journal of Magnetism and Magnetic Materials, 310(2), 948-950, 20070401
  64. Raman scattering study of type-I clathrate compounds: A8Ga16Ge30 (A = Eu, Sr, Ba), Journal of Magnetism and Magnetic Materials, 310(2), 954-956, 20070401
  65. Raman scattering on La3Pd20X6 (X = Si, Ge), Journal of Magnetism and Magnetic Materials, 310(2), 984-986, 20070401
  66. Raman scattering study of filled skutterudite compounds, Journal of Physics: Conference Series, 92, 012123, 20071201
  67. Raman scattering on KOs2O6, Journal of Physics: Conference Series, 9, 012124, 20071201
  68. Raman scattering of type-I clathrate compounds: A8Ga16Ge30(A = Eu, Sr, Ba) and Sr8Ga16Si30-xGex, Journal of Physics: Conference Series, 92, 012171, 20071201
  69. Low-lying optical modes in filled skutterudites using inelastic x-ray scattering techniques, Journal of Physics: Conference Series, 92, 012171, 20071201
  70. 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
  71. 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
  72. 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
  73. 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
  74. Raman Scattering Study of Guest Ion Motion in Cage Compounds, Journal of Physical Society of Japan, 77(SUPPLMENT), 142-147, 20080301
  75. First-priciples calculation of lattice dynamics of skutterudite compounds, 77(SUPPLEMENT), 248-250, 20080301
  76. Raman scattering of type-I clathrate compounds, 77(SUPPLEMENT), 254-256, 20080301
  77. Direct Observation of Low-Energy Sm Phonon in SmRu4P12, 77(3), 033601/4 PAGES, 20080301
  78. Raman scattering of KOs2O6, Physical Review B, 77(6), 064303/ 6 PAGES, 20080315
  79. Anomalous phonon properties in the silicide superconductor CaAlSi and SrAlSi, Physical Review B, 78(18), 184303/10 PAGES, 20081101
  80. 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
  81. 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
  82. Optical conductivity of rattling phonons in type-I clathrate Ba8Ga16Ge30, PHYSICAL REVIEW B, 79(21), 200906
    Link to Paper Search Results by DOI
  83. Raman scattering investigation of beta-pyrochlore osmium oxides, AOs2O6 (A=K, Rb, and Cs), Journal of Physics: Conference Series, 150, 052067, 20090401
  84. Crystal Field Excitations of Filled Skutterudite PrRu4P12 by Raman Scattering, Journal of Physics: Conference Series, 150, 042147, 20090401
  85. Valence dependence of interatomic interactions in RB6, Journal of Physics: Conference Series, 176, 0120131, 20090701
  86. Raman scattering of rare earth hexaborides, Journal of Physics: Conference Series, 176, 012032, 20090701
  87. 149Sm nuclear resonant inelastic scattering of SmB6, Journal of Physics: Conference Series, 176, 012033, 20090701
  88. 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
  89. 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
  90. Raman scattering study in iridium pyrochlore oxides, Journal of Physics: Conference Series, 200, 012054, 20100201
  91. Off-center rattling modes and glasslike thermal conductivity in the type-I clathrate Ba8Ga16Sn30, Physical Review B, 81(20), 205207, 20100501
  92. Raman scattering study of nano-particle BaTiO3, Chinese Journal of Physics, 49(1), 49-55, 20110201
  93. Raman scattering of hydrogen storage material LiNH2, Chinese Journal of Physics, 49(1), 294-300, 20110201
  94. Structural transition of RhSb3 under high pressures, Chinese Journal of Physics, 49(1), 323-330, 20110201
  95. Raman spectral analysis of metal-insulator transitions in skutterudite compound PrRu4P12, Chinese Journal of Physics, 49(1), 471-479, 20110201
  96. Low temperature phase of YbPd investigated by Raman scattering, Journal of Physics: Conference Series, 273(1), 012030/1-012030/4, 20110201
  97. Raman Scattering of YB6, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80, 201107
  98. Raman scattering investigation on YbPd, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80, 201107
  99. Raman scattering study of lattice dynamics in caged compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80, 201107
  100. The anharmonic vibration of Li in lithium amide, APPLIED PHYSICS LETTERS, 100(15), 20120409
    Link to Paper Search Results by DOI
  101. 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
  102. 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
  103. 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
  104. 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
  105. 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
  106. First-principles calculations of lattice vibrations on LaT2Zn20 (T = Ru and Ir), Journal of Physics: Conference Series, 391, 012016, 20130101
  107. Raman scattering spectra of LaRu2Al10 and CeRu2Al10, Journal of Physics: Conference Series, 391, 012050, 20130101
  108. Crystal Electric Field Study in Pr(Os1-xRux)4Sb12 by Raman Scattering, JPS Conf. Proc., 3, 015040/1-015040/6, 20140616
  109. Measurement of Crystal Field Excitations in NdT2Al10 (T=Ru and Os) by Raman Scattering, JPS Conf. Proc., 3, 011070/1-011070/6, 20140616
  110. Atomic Dynamics and Structural Transitions in Caged Compounds RRu2Zn20 (R=La and Pr), JPS Conf. Proc., 3, 011068/1-011068/5, 20140616
  111. Inelastic X-ray Scattering of Valence Fluctuating YbPd, JPS Conf. Proc., 3, 011037/1-011037/5, 20140616
  112. 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
  113. Valence-lattice interaction on YbPd, Journal of Physics: Conference Series, 592, 012061/1-012061/6, 20150325
  114. 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
  115. Low-energy optical phonon modes in the caged compound LaRu2Zn20, PHYSICAL REVIEW B, 93(6), 20160209
    Link to Paper Search Results by DOI
  116. Guest Ion Motion in Cage Structure Crystals Investigated by Raman Scattering, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77, 142-147, 2008
  117. Raman Scattering of Type-I Clathrate Compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 77, 254-256, 2008
  118. 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
  119. 27pXQ-4Raman scattering on (EDO-TTF)_2PF_6., Meeting abstracts of the Physical Society of Japan, 60(1), 20050304
  120. 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
  121. 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
  122. 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
  123. 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
  124. Retreat from Stress: Rattling in a Planar Coordination, ADVANCED MATERIALS, 30(13), 20180327
    Link to Paper Search Results by DOI
  125. 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
  126. Antiferroelectric distortion with anomalous phonon softening in the excitonic insulator Ta2NiSe5, PHYSICAL REVIEW B, 98(4), 20180730
    Link to Paper Search Results by DOI
  127. Soft-phonon driven hexagonal-orthorhombic phase transition in BaVS3, PHYSICAL REVIEW B, 99(14), 20190423
    Link to Paper Search Results by DOI
  128. 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
  129. 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
  130. 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
  131. 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
  132. 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
  133. 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
  134. 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
  135. 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
  136. 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
  137. 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
  138. 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
  139. Zn-Substitution Effect on Metal-Semiconductor Transition in Tetrahedrite Cu12Sb4S13, JPS Conference Proceedings, 29, 013008, 20190925
  140. 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
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  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
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  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
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  2. KAKENHI, Investigation of Alkaline metal vibration effect on the electric states in β-pyrochlore oxides, 2009, 2010
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