RIKEN SPring-8 Center Materials Dynamics Group

Group Director: Alfred Baron (Ph.D.)

Japanese Page

Research Summary

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.

Related Research Fields

Physics
Earth and planetary science
Material engineering

Keywords

Phonons and Lattice Dynamics of Solids
Dynamics of Liquids
Elasticity
Electronic Structure via NRIXS
X-Ray Instrumentation

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

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) http://dx.doi.org/10.1038/ncomms9942
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), http://dx.doi.org/10.1103/PhysRevB.93.020301
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, http://link.aps.org/doi/10.1103/PhysRevB.92.054206
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