Materials Dynamics Laboratory

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.

Publications

1. Baron A Q R.:
   "The RIKEN Quantum NanoDynamics Beamline (BL43LXU): The Next Generation for Inelastic X-Ray Scattering"
   SPring-8 Information Newsletter, 15 14 (2010)
2. 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)
3. Baron A Q R, Uchiyama H, Tanaka Y, Tsutsui S, Ishikawa D, Lee S, Heid R, Bohnen K.-P, Tajima S, Ishikawa T.:
   "Kohn Anomaly in MgB by Inelastic X-Ray Scattering"
   Physical Review Letters, 92, 197004 (2004)
4. T. Fukuda, A.Q.R. Baron, H. Nakamura, S. Shamoto, M. Ishikado, M. Machida, H. Uchiyama, A. Iyo, H. Kito, J. Mizuki, M. Arai, and H. Eisaki:
   "Soft and isotropic phonons in PrFeAsO1-y."
   Physical Review B 84 064504 (2011)
5. Ishikawa D, Inui M, Matsuda K., Tamura K., Tsutsui S, Baron A Q R.:
   "Fast sound in expanded fluid Hg accompanying the metal-non-metal transition"
   Physical Review Letters 93 97801 (2004)
6. Uchiyama H, Baron A Q R, Tsutsui S, Tanaka Y, Hu W Z, Yamamoto A., Tajima S, Endoh Y.:
   "Softening of the Cu-O bond stretching phonon in tetragonal HgBa2CuO4+5"
   Physical Review Letters 92 197005 (2004)
7. Marc de Boissieu, Sonia Francoual, Marek Mihalkovi, Kaoru Shibata, Alfred Q. R. Baron, Yvan Sidis, Tsutomu Ishimasa, Dongmei Wu, Thomas Lograsso, Louis-Pierre Regnault, Franz Gahler, Satoshi Tsutsui, Bernard:
   "Lattice dynamics of the Zn-Mg-Sc icosahedral quasicrystal and its Zn-Sc periodic 1/1 approximant"
   Nature Materials 6, 977 - 984 (2007), Published online: 4 November 2007
8. 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
9. Transverse Acoustic Excitations in Liquid Ga:
   "S. Hosokawa, M. Inui, Y. Kajihara, K. Matsuda, T. Ichitsubo, W.-C. Pilgrim, H. Sinn, L. E. Gonza'lez, D. J. Gonzalez, S. Tsutsui, and A. Q. R. Baron"
   Physical Review Letters 102 (2009) 105502