Centers & Labs

RIKEN SPring-8 Center

Materials Dynamics Group

Group Director: Alfred Baron (Ph.D.)
Alfred  Baron(Ph.D.)

The focus of the laboratory is the dynamics of materials on meV energy scales (THz frequencies) and atomic length scales, as measured using inelastic x-ray scattering. The largest project of the lab is the design, construction and comissioning of a new and uniquely powerful beamline for inelastic x-ray scattering. It should provide unprecedented capability to measure both atomic dynamics and electronic excitations with high resolution. Other projects include investigation of phonons in multiferroics, correlated-electron materials, especially superconductors, liquid dynamics, elastic constants of materials under pressure, and development of instrumentation, especially x-ray optics.

Research Subjects

  • Investigation of phonons and electronic scattering in mutiferroics and superconductors
  • Investigations of liquid dynamics.
  • Elastic constants of materials in extereme conditions.
  • Development of new x-ray scattering techniques.
  • Design, construction, & comisioning of a new beamline for inelastic x-ray scattering at SPring-8 with unprecendented intesity.

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.
  1. A.Q.R. Baron.:
    "The RIKEN Quantum NanoDynamics Beamline (BL43LXU): The Next Generation for Inelastic X-Ray Scattering"
    SPring-8 Information Newsletter, 15 14 (2010)
  2. A.Q.R. Baron.:
    "High-Resolution Inelastic X-Ray Scattering I&II"
    Chapter in "Synchrotron Light Sources and Free-Electron Lasers", E. Jaeschke, S. Khan, J. R. Schneider and J. B. Hastings, eds., Springer, 2015 (arXiv:1504.01098)
  3. Y. Nakajima, S. Imada, K. Hirose, T. Komabayashi, H. Ozawa, S. Tateno, S. Tsutsui, Y. Kuwayama, and A.Q.R. Baron.:
    "Carbon depleted outer core revealed by sound velocity measurements of liquid Fe-C alloy"
    Nature Communications, 6, (2015)
  4. *T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata, T. Sakai, S. Tsutsui,6 D. Ishikawa, R. Shiraishi, Y. Seto, T. Tsuchiya, A. Q. R. Baron.:
    "Constraints on Earth’s inner core composition inferred from measurements of the sound velocity of hcp-iron in extreme conditions"
    Sci. Adv. 2016; 2 : e1500802
  5. N. Murai, T. Fukuda, T. Kobayashi, M. Nakajima, H. Uchiyama, D. Ishikawa,S. Tsutsui, H. Nakamura, M. Machida, S. Miyasaka, S. Tajima, and A. Q. R. Baron.:
    "Effect of magnetism on lattice dynamics of SrFe2As2 using high-resolution inelastic x-ray scattering"
    Physical Review B, Phys. Rev. B 93, 020301(R),
  6. M. Inui, Y. Kajihara, S. Munejiri, S. Hosokawa, A. Chiba, K. Ohara, S. Tsutsui and A.Q.R. Baron.:
    "Anomalous dispersion of the acoustic mode in liquid Bi"
    Physical Review B 95 (2015) 54206,
  7. D. Ishikawa, D. S. Ellis, H. Uchiyama and A.Q.R. Baron.:
    "Inelastic x-ray scattering with 0.75 meV resolution at 25.7 keV using a temperature gradient analyzer."
    Journal of Synchrotron Radiation, 22 (2015) 3
  8. Fukui H. Katsura T, Kuribayashi T, Matsuzak T, Yoneda A, Ito, Kudoh Y, Tsutsui S., BaronA.Q.R.:
    "Precise determination of elastic constants by high-resolution inelastic X-ray scattering"
    Journal of Synchrotron Radiation 15, 618-623 (2008)
  9. D. Ishikawa and A.Q.R. Baron.:
    "Temperature gradient analyzers for compact high-resolution X-ray spectrometers."
    Journal of Synchrotron Radiation, 17 (2010) 12-24

Contact Information

1-1-1 Kouto, Sayo-cho
Sayo-gun, Hyogo
679-5148 Japan

Email: baron [at]

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Recent Research Results