Renormalized Motion of Dysprosium Atoms Filling Boron Cages of DyB6
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概要
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The lattice dynamics of DyB6 are investigated by an inelastic X-ray scattering technique. The measured phonon modes are dominated by the motion of Dy ions in oversized boron cages. These soften remarkably as temperature is decreased, with the energy of the longitudinal phonon for the propagation vector \mbi{q}_{1}=(1/2,0,0) decreasing by 29% from 300 K down to the phase transition temperature of 31 K. The dispersion relation curves show kinklike anomalies at \mbi{q}_{\text{k}}=(0.38,0.38,0). The observed phenomena are very similar to those previously observed in GdB6 [Iwasa et al.: Phys. Rev. B 84 (2011) 214308]. We note analogous phonon anomalies in the heavier rare-earth hexaboride systems, owing to the interplay between the motion of rare-earth atoms and the electronic state, particularly characterized by the Friedel oscillation.
- 2012-11-15
著者
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BARON Alfred
Materials Dynamics Laboratory, SPring-8 RIKEN
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TSUTSUI Satoshi
Research and Utilization Division, SPring-8 JASRI
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Tsutsui Satoshi
Japan Synchrotron Radiation Res. Inst. Hyogo Jpn
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Tsutsui Satoshi
Japan Synchrotron Radiation Research Institute Spring-8
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Hasegawa Takumi
Graduate School Of Integrated Arts And Sciences Hiroshima University
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Udagawa Masayuki
Graduate School Of Integrated Arts And Sciences Hiroshima University
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Ogita Norio
Graduate School Of Integrated Arts And Sciences Hiroshima University
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Iwasa Kazuaki
Department Of Physics Faculty Of Science And Technology Keio University
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Tsutsui Satoshi
Japan Synchrotron Radiation Research Institute
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Kobayashi Hiroki
Department Of Analytical Chemistry Of Medicines Showa Phamaceutical University
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Kuwahara Keitaro
Institute Of Applied Beam Science Ibaraki University
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Sato Takahiro
Department Of Agricultural And Biological Chemistry College Of Bioresource Sciences Nihon University
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Udagawa Masayuki
Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima 739-8521, Japan
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Utsumi Yoshihiro
Institute of Applied Beam Science, Ibaraki University, Mito 310-8512, Japan
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Ogita Norio
Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima 739-8521, Japan
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Saito Kotaro
Department of Physics, Tohoku University, Sendai 980-8578, Japan
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Amano Mitsuhide
Department of Physics, Tohoku University, Sendai 980-8578, Japan
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Baron Alfred
Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
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Tsutsui Satoshi
Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198, Japan
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Tsutsui Satoshi
SPring-8/JASRI, Sayo, Hyogo 679-5198, Japan
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