Yukio Kajihara

Last Updated :2025/05/09

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Associate Professor
E-mail
kajiharahiroshima-u.ac.jp
Self-introduction
I study disordered materials (*) from the view point of physics. * materials without long periodic order such like liquids and glasses

Basic Information

Academic Degrees

  • Doctor of Science, Kyoto University
  • Master of Science, Kyoto University

Educational Activity

  • [Bachelor Degree Program] School of Integrated Arts and Sciences : Department of Integrated Arts and Sciences : Integrated Arts and Sciences
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Physics Program
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Transdisciplinary Science and Engineering Program
  • [Doctoral Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Physics Program
  • [Doctoral Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Transdisciplinary Science and Engineering Program

Research Fields

  • Mathematical and physical sciences;Physics;Mathematical physics / Fundamental condensed matter physics

Research Keywords

  • Physics of disordered materials
  • liquid-liquid transition
  • fluctuation
  • x-ray
  • Supercritical Fluid
  • Fluid Metal
  • Metal Nonmetal Transition

Educational Activity

Course in Charge

  1. 2025, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Physics I
  2. 2025, Liberal Arts Education Program1, 3Term, Experimental Methods and Laboratory Work in Physics I
  3. 2025, Liberal Arts Education Program1, 3Term, Experimental Methods and Laboratory Work in Physics I
  4. 2025, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Physics II
  5. 2025, Liberal Arts Education Program1, 4Term, Experimental Methods and Laboratory Work in Physics II
  6. 2025, Liberal Arts Education Program1, 4Term, Experimental Methods and Laboratory Work in Physics II
  7. 2025, Liberal Arts Education Program1, 3Term, Fundamental PhysicsI
  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, 1Term, Statistical Physics I
  12. 2025, Undergraduate Education, 1Term, Physics of Complex Liquids and Soft Matters
  13. 2025, Undergraduate Education, 2Term, Frontiers of Material Science
  14. 2025, Graduate Education (Master's Program) , 3Term, Transdisciplinary Science and Engineering Program Common Subjects 1 (Smart Development)
  15. 2025, Graduate Education (Master's Program) , 2Term, Fundamentals of Complex Matter

Research Activities

Academic Papers

  1. ★, Existence of density inhomogeneity of liquid Te associated with liquid-liquid phase transition, JOURNAL OF PHYSICS-CONDENSED MATTER, 36(34), 20240828
    Link to Paper Search Results by DOI
  2. Observation of plasmon excitation in liquid silicon by inelastic x-ray scattering, JOURNAL OF PHYSICS-CONDENSED MATTER, 36(7), 20240221
    Link to Paper Search Results by DOI
  3. Collective modes in molten CsCl, CuCl and AgI observed by inelastic x-ray scattering, JOURNAL OF MOLECULAR LIQUIDS, 390, 20231115
    Link to Paper Search Results by DOI
  4. 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
  5. Experimental observation of mesoscopic fluctuations to identify origin of thermodynamic anomalies of ambient liquid water, PHYSICAL REVIEW RESEARCH, 5(1), 20230216
    Link to Paper Search Results by DOI
  6. Structural changes across thermodynamic maxima in supercooled liquid tellurium: A water-like scenario, Proc. Natl. Acad. Sci., 119, e2202044119:1-e2202044119:7, 20220606
  7. Experimental Observation of Maximum Density Fluctuation in Liquid Te, arXiv, 2201(10065), 1-5, 20220125
  8. Structural changes across thermodynamic maxima in supercooled liquid tellurium: a water-like scenario, arXiv, 2201(06838), 1-24, 20220118
  9. Experimental Observation of Mesoscopic Fluctuations to Identify Origin of Thermodynamic Anomalies of Ambient Liquid Water, arXiv, 2111(06589), 1-14, 20211112
  10. X-ray diffraction measurement of liquid As2Se3 by using third-generation synchrotron radiation, JOURNAL OF NON-CRYSTALLINE SOLIDS, 353(18-21), 1985-1989, 20070615
    Link to Paper Search Results by DOI
  11. Thermal radiation method: proposal of a new technique for measuring interfacial or surface fluctuations, JOURNAL OF APPLIED CRYSTALLOGRAPHY, 40, S687-S690, 20070401
    Link to Paper Search Results by DOI
  12. ★, Density fluctuations at the continuous liquid-liquid phase transition in chalcogen systems, PHYSICAL REVIEW B, 86(21), 20121206
    Link to Paper Search Results by DOI
  13. Transverse excitations in liquid Sn, JOURNAL OF PHYSICS-CONDENSED MATTER, 25(11), 20130320
    Link to Paper Search Results by DOI
  14. Chemical order in liquid As2Se3 at high temperatures obtained by X-ray scattering and reverse Monte Carlo modeling, JOURNAL OF NON-CRYSTALLINE SOLIDS, 366, 22-29, 20130415
    Link to Paper Search Results by DOI
  15. Electron momentum density in liquid silicon, PHYSICAL REVIEW B, 88(11), 20130916
    Link to Paper Search Results by DOI
  16. Mercury wetting film on sapphire, Physical Review E, 63, 051601, 20010501
  17. ★, Optical emissivity study of the critical fluctuations in mercury wetting film on sapphire, Journal of Physics: Condensed Matter, 15, 6179-6198, 20030917
  18. Electrical Resistivity of Carbon Micro Coil Measured by Multi-Probe Unit Installed in a Scanning Electron Microscope, Japanese Journal of Applied Physics, 44, 6867-6869, 20050908
  19. Ellipsometric Study of Prewetting Transition at Mercury-Sapphire Interface, Journal of Physics: Condensed Matter, 10, 11589-11594, 19980401
  20. Dielectric relaxation of water and heavy water in the whole fluid phase, The Journal of Chemical Physics, 110, 3026-3036, 19990401
  21. Sound attenuation in super critical fluid mercury, Journal of Non-Crystalline Solids, 250-252, 139-143, 19990401
  22. Wetting Phenomena at Mercury-Sapphire Interface under High Temperature and Pressure, Journal of Non-Crystalline Solids, 250-252, 209-213, 19990401
  23. Wetting Phenomena of Mercury on Sapphire Studied by Optical Emissivity Measurement, Journal of Physics: Condensed Matter, 12, 375-381, 20000401
  24. Anomalous sound attenuation in liquid Te50Se50 mixture under high pressure, Journal of Physics: Condensed Matter, 12, 7323-7339, 20000401
  25. Dielectric relaxation measurements on methanol up to the super critical region, Journal of Physics: Condensed Matter, 13, 10307-10320, 20010401
  26. Slow structural relaxation in liquid Te-Se mixtures, Journal of Non-Crystalline Solids, 312-314, 361-365, 20020401
  27. Slow dynamics due to the metal-nonmetal transition in liquid mercury, Journal of Non-Crystalline Solids, 312-314, 265-268, 20020401
  28. Size-selective EXAFS spectroscopy of free selenium clusters, Physical Review Letters, 89, 243401, 20020401
  29. Two-dimensional supercritical fluid mercury formed on a sapphire substrate, Journal of Non-Crystalline Solids, 312-314, 472-480, 20020401
  30. Critical fluctuations of mercury wetting film on sapphire, Journal of Non-Crystalline Solids, 312-314, 489-493, 20020401
  31. X-Ray Absorption and De-Excitation Processes of Krypton Clusters Studied by the XAFS-PEPICO Synchronous Measurements, Physica Scripta, T115, 984-985, 20050401
  32. Viscoelastic narrowing of a collective mode in molten CsCl observed by inelastic x-ray scattering, Journal of Physics: Condensed Matter, 19(46), 466110, 20071121
  33. Small-angle x-ray scattering of supercritical fluid Hg: Bi-impurity effect, Journal of Physics: Conference Series, 98, 012002, 20080306
  34. Structural study of expanded fluid cesium, Journal of Physics: Conference Series, 98, 012003, 20080306
  35. X-ray diffraction measurements of expanded fluid sulfur up to the supercritical region, Journal of Physics: Conference Series, 98, 012008, 20080306
  36. Structural fluctuations in expanded fluid Se accompanying the semiconductor-metal transition, J. Phys.: Conference series, 98, 012028, 20080306
  37. Dynamical structure in liquid Te using inelastic x-ray scattering: from semiconductor-metal transition to metallic regime, Journal of Physics: Conference Series, 98, 022001, 20080306
  38. Collective dynamics of As2Se3 glass investigated by inelastic X-ray scattering, Journal of Non-Crystalline Solids, 354, 2715-2718, 20080501
  39. ★, Dynamical inhomogeneity of liquid Te near the melting temperature proved by inelastic x-ray scattering measurements, Journal of Physics: Condensed Matter, 20, 494244, 20081210
  40. Transverse Acoustic Excitations in Liquid Ga, Physical Review Letters, 102, 105502, 20090313
  41. Small-angle x-ray scattering and density measurements of liquid Se50-Te50 mixture at high temperatures and high pressures using synchrotron radiation, Journal of Physics: Conference Series, 215, 012078, 20100301
  42. Icosahedral ordering in liquid iron studied via x-ray scattering and Monte Carlo simulations, Physical Review B, 80, 180201, 20091101
  43. Wide and small angle X-ray scattering measurements of supercritical water using synchrotron radiation, Journal of Physics: Conference Series, 215, 012090, 20100301
  44. Packing structure of chains and rings in an expanded liquid Se80Te20 mixture near the semiconductor to metal transition, Journal of Physics: Condensed Matter, 22, 455103, 20101001
  45. Static and dynamical inhomogeneity at liquid - liquid phase transition of Se-Te mixtures, EPJ Web of Conference, 15, 02002, 20110501
  46. Synchrotron radiation studies of an expanded fluid alkali metal, Eur. Phys. J. Special Topics, 196, 95-107, 20110501
  47. Transverse excitations in liquid Ga, Eur. Phys. J. Special Topics, 196, 85-93, 20110501
  48. Inelastic x-ray scattering measurements of dynamical cross-over in liquid As2Se3 at high temperature and high pressure, Eur. Phys. J. Special Topics, 196, 167-174, 20110501
  49. Transverse excitations in liquid metals, AIP Conf. Proc, 1518, 695-702, 20130301
  50. Inelastic x-ray scattering study of plasmon dispersions in solid and liquid Rb, PHYSICAL REVIEW B, 89(1), 20140129
    Link to Paper Search Results by DOI
  51. Transverse excitations in liquid Fe, Cu and Zn, Journal of Physics: Condensed Matter, 27(19), 194104-1-7, 20150520
    Link to Paper Search Results by DOI
  52. Inelastic X-ray Scattering Study on Plasmon Dispersion in Liquid Cs, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 84(8), 20150815
    Link to Paper Search Results by DOI
  53. Microscopic Elastic Properties of Polycrystalline Mg85Zn6Y9 Alloy with Long-Period Stacking Ordered 18R Phase Investigated by Inelastic X-ray Scattering, MATERIALS TRANSACTIONS, 56(7), 914-916, 20150327
    Link to Paper Search Results by DOI
  54. Anomalous dispersion of the acoustic mode in liquid Bi, PHYSICAL REVIEW B, 92(5), 20150825
    Link to Paper Search Results by DOI
  55. Inelastic x-ray scattering studies on dynamic structure factor of polymeric liquid Se under pressure, AIP conf. Proc., 1673, 020002, 20150817
  56. X-ray Compton scattering experiments for fluid alkali metals at high temperatures and pressures, AIP Conf. Proc., 1673, 020004, 20150817
  57. Critical Indices nu and gamma Experimentally Obtained at the Liquid-Vapor Critical Point in Fluid Hg, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85(3), 20160315
    Link to Paper Search Results by DOI
  58. Icosahedral ordering in liquid iron studied via x-ray scattering and Monte Carlo simulations, PHYSICAL REVIEW B, 80(18), 20091105
  59. Charge inhomogeneity in an expanded fluid metal: X-ray Compton scattering observation, EPL, 117(1), 20170228
    Link to Paper Search Results by DOI
  60. Isotactic poly(4-methyl-1-pentene) melt as a porous liquid: Reduction of compressibility due to penetration of pressure medium, JOURNAL OF CHEMICAL PHYSICS, 146(19), 20170521
    Link to Paper Search Results by DOI
  61. Phonon Excitations in Pd40Ni40P20 Bulk Metallic Glass by Inelastic X-Ray Scattering, Mater. Sci. Forum, 879, 767-772, 20161201
    Link to Paper Search Results by DOI
  62. Asymmetrical bonding in liquid Bi disentangled by inelastic X-ray scattering, EPJ Web. of Conf.(EPJ Web. of Conf.), 06001-1-06001-7, 20170821
    Link to Paper Search Results by DOI
  63. Dispersion relations of the acoustic modes in divalent liquid metals, EPJ Web. of Conf., 151, 06002-1-06002-6, 20170821
    Link to Paper Search Results by DOI
  64. Inelastic x-ray scattering measurements of liquid waterglycerol mixtures, EPJ Web. of Conf., 151, 06003-1-06003-8, 20170821
    Link to Paper Search Results by DOI
  65. ★, Experimental Verification of Liquid-liquid Critical Point Hypothesis from the View Point of `Fluctuations', The Review of High Pressure Science and Technology, 26(4), 288-296, 20161227
  66. X-ray Compton Scattering Study of Liquid Germanium and Tin, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 86(12), 124703-1-124703-6, 20171215
    Link to Paper Search Results by DOI
  67. Peculiar atomic dynamics in liquid GeTe with asymmetrical bonding: Observation by inelastic x-ray scattering, PHYSICAL REVIEW B, 97(17), 20180514
    Link to Paper Search Results by DOI
  68. Viscoelastic anomaly accompanying anti-crossing behaviour in liquid As2Se3, JOURNAL OF PHYSICS-CONDENSED MATTER, 30(28), 20180622
    Link to Paper Search Results by DOI
  69. Plasmons in Liquid Rb at Elevated Temperatures Studied by Inelastic X-ray Scattering, J. Phys. Soc. Jpn., 87, 084703-1-084703-7, 20180718
    Link to Paper Search Results by DOI
  70. Static and dynamic structures of liquid Ba8Ga16Sn30: a melt of the thermoelectric clathrate compounds, JOURNAL OF PHYSICS-CONDENSED MATTER, 30(45), 20181114
    Link to Paper Search Results by DOI
  71. Dynamical sound speed and structural inhomogeneity in liquid Te studied by inelastic x-ray scattering, J. Non-Crystalline Solids: X, 1, 100006-1-100006-6, 20190112
    Link to Paper Search Results by DOI
  72. Structural studies on fluid sulfur at high temperatures and high pressures: I. Atomic dynamics investigated by inelastic x-ray scattering, J. Non-Crystalline Solids, 522, 119571-1-119571-6, 20190715
    Link to Paper Search Results by DOI
  73. Detection of collective optic excitations in molten NaI, CONDENSED MATTER PHYSICS, 22(4), 20190819
    Link to Paper Search Results by DOI
  74. Peculiar temperature dependence of dynamical sound speed in liquid Se50Te50 by inelastic x-ray scattering, JOURNAL OF PHYSICS-CONDENSED MATTER, 32(21), 20200513
    Link to Paper Search Results by DOI
  75. Static density response function studied by inelastic x-ray scattering: Friedel oscillations in solid and liquid Li, PHYSICAL REVIEW B, 102(5), 20200821
    Link to Paper Search Results by DOI
  76. Furnace for Inelastic X-Ray Scattering from Liquids up to 1600 degrees C, PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 257(11), 20201101
    Link to Paper Search Results by DOI
  77. X-Ray Compton Scattering Study of Liquid Sodium at Elevated Temperatures, PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 257(11), 20201101
    Link to Paper Search Results by DOI
  78. Structural studies on fluid Hg and fluid Se at high temperatures and high pressures by means of X-ray diffraction and small angle X-ray scattering, ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS, 235(1-2), 3-24, 20210218
    Link to Paper Search Results by DOI
  79. ★, Experimental observation of density fluctuations in liquid metals associated with liquid-liquid, liquid-gas and metal-nonmetal transitions, J. Phys.: Condens. Matter, 32, 274001, 20200407
  80. Longitudinal acoustic and higher-energy excitations in the liquid phase-change material Ge2Sb2Te5, PHYSICAL REVIEW B, 104(6), 20210816
    Link to Paper Search Results by DOI
  81. Low energy excitation in liquid Sb and liquid Bi observed in inelastic x-ray scattering spectra, JOURNAL OF PHYSICS-CONDENSED MATTER, 33(47), 20211124
    Link to Paper Search Results by DOI

Invited Lecture, Oral Presentation, Poster Presentation

  1. Simple idea to solve Kauzmann paradox of glass transition phenomena, Yukio Kajihara, Masanori Inui, Ayano Chiba, 14th International Conference on the Structure of Non-Crystalline Materials, 2019/11/08, Without Invitation, English, Kobe, Japan
  2. Another scenario for glass transition phenomena, Yukio Kajihara, Masanori Inui, Ayano Chiba, 14th International Conference on the Structure of Non-Crystalline Materials, 2019/11/04, Without Invitation, English, Kobe, Japan
  3. Density fluctuations of supercooled liquid Te, Y. Kajihara, Y. Kajihara, M. Inui, K. Ohara, K. Matsuda and T. Hagiya, The 17th international conference on Liquid and Amorphous Metals (LAM17), 2019/08/30, Without Invitation, English, Lyon in France
  4. Where Come from Dynamic Heterogeneity in Glass Transition? : Similarity with Liquid-Liquid Transition, Y. Kajihara, M. Inui and A. Chiba, Y. Kajihara, M. Inui and A. Chiba, 8th International Discussion Meeting on Relaxations in Complex Systems, 2017/07/26, Without Invitation, English, Wisla, Poland
  5. Ultrasonic Sound Velocity Measurements for Liquid Water-Glycerol Mixtures, K. Nukumizu, Y. Kajihara and M. Inui, K. Nukumizu, Y. Kajihara and M. Inui, 8th International Discussion Meeting on Relaxations in Complex Systems, 2017/07/24, Without Invitation, English, Wisla, Poland
  6. Simple scenario for glass transition phenomena based on liquid-liquid transition framework, Y. Kajihara, M. Inui, A. Chiba, Y. Kajihara, M. Inui, A. Chiba, 10th Liquid Matter Conference, 2017/07/17, Without Invitation, Japanese, European Physical Society, Ljubljana, Slovenia
  7. Inelastic x-ray scattering measurements of liquid water-glycerol mixtures, Y. Kajihara, Y. Kajihara, N. Shibata, M. Inui, K. Matsuda, S. Tsutsui, The 16th International Conference on Liquid and Amorphous Metals (LAM-16), 2016/09/06, Without Invitation, English, Bonn, Germany
  8. Sound velocity measurements of liquid water-methanol mixtures, N. Shibata, N. Shibata, Y. Kajihara, K. Nukumizu, M. Inui, S. Tsutsui, The 16th International Conference on Liquid and Amorphous Metals (LAM-16), 2016/09/06, Without Invitation, English, Bonn, Germany
  9. Time concept of entropy: from "fast sound" to glass transition, Y. Kajihara, Y. Kajihara, M. Inui and A. Chiba, The 16th International Conference on Liquid and Amorphous Metals (LAM-16), 2016/09/05, Without Invitation, English, Bonn, Germany
  10. "Fluctuations" in liquid water-alcohol mixtures, Y. Kajihara, Y. Kajihara, M. Inui, S. Di Fonzo, M. Saito, C. Masciovecchio, S. Tsutsui and A.Q.R. Baron, 9th Liquid Matter Conference (Liquids2014), 2014/07/22, Without Invitation, English, European Physical Society, Lisbon, Portugal
  11. "Fast sound" measurements for liquid water-alcohol mixtures, Y. Kajihara, Y. Kajihara, S. Di Fonzo, M. Saito, C. Masciovecchio, M. Inui, S. Tsutsui and A.Q.R. Baron, 8th International Conference on Inelastic X-ray Scattering (IXS2013), 2013/08/13, Without Invitation, English, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
  12. Direct detection of fluctuations in liquids - new approach for liquid-liquid phase transition -, Y. Kajihara, Perugia university seminar, 2013/02/26, Without Invitation, English, Perugia University, Italy, Perugia University, Italy
  13. Direct detection of fluctuations in liquids - new approach for liquid-liquid phase transition -, Y. Kajihara, Sapienza University of Rome Seminar, 2013/02/12, Without Invitation, English, Sapienza University of Rome, Italy, Sapienza University of Rome, Italy
  14. Direct detection of fluctuations in liquids - new approach for liquid-liquid phase transition -, Y. Kajihara, Chalmers University Seminar, 2013/02/08, Without Invitation, English, Chalmers University, Sweden, Chalmers University, Sweden
  15. Study of liquid-liquid phase transitions of chalcogens and water using X-ray techniques, Y. Kajihara, Elettra Seminar, 2010/07/09, Without Invitation, English, Elettra, Italy, Elettra, Italy
  16. Phase transition of liquid Se-Te mixtures, Y. Kajihara, Y. Kajihara, M. Inui and K. Matsuda, International workshop on Phase-change materials and disordered materials - towards new functional materials, With Invitation, English, Osaka Science and Technology Center, Japan

External Funds

Acceptance Results of Competitive Funds

  1. KAKENHI, 2016, 2018
  2. KAKENHI, 2014, 2015
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  3. KAKENHI, "Fast sound" phenomena and liquid-liquid phase transition in liquid water: direct measurement of fluctuations = Entropy, 2012, 2013
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  4. KAKENHI, Effects of high-pressure environments on atomic dynamics in disordered materials with covalent bonds, 2011, 2013
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  5. KAKENHI, Transverse phonon modes in liquids: Observation by inelastic x-ray scattering, 2010, 2012
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  6. KAKENHI, Liquid dynamics at metal-nonmetal transition-Attempt at description of the phase transition through fluctuations-, 2008, 2010
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  7. KAKENHI, Studies on anomalous dynamic properties in supercritical metallic fluids using a high-resolution inelastic x-ray scattering technique, 2008, 2010
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  8. KAKENHI, 2005, 2006
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  9. KAKENHI, Bonding, Fluctuations and Dynamics in Supercritical Metallic Fluids Using Synchrotron Radiation, 2004, 2006
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Social Activities

Organizing Academic Conferences, etc.

  1. 2020/02, 2020/02
  2. 2017/08, 2017/08
  3. 2017/03, 2017/03
  4. 2014/09
  5. 2013/09
  6. 2012/08
  7. 2011/08
  8. 2010/11