Ultrasonic Dispersion in All Elastic Moduli and Softening at Low Temperatures in Filled Skutterudite LaFe4Sb12
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概要
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To clarify the origin of ultrasonic dispersion due to the so-called rattling motion in LaFe4Sb12, we measured the temperature dependences of elastic moduli and ultrasonic attenuation. We found the ultrasonic dispersion to be between 35 and 80 K in all elastic moduli, suggesting no-mode-selectivity of ultrasound. Experimental results and theoretically calculated density of states indicate that the $d$-electronic states of transition metal ions play an important role in ultrasonic dispersion. The theory based on the coupling between an acoustic phonon and some optical phonons interacting with electrons is compatible with no-mode-selective ultrasonic dispersion, and it suggests a stronger electron–phonon coupling in all elastic modes in LaFe4Sb12. Low-temperature elastic softening was observed in all elastic moduli, and it continues down to 0.4 K. There is a possibility that low-temperature softening originates from quantum tunneling motion or a novel quantum effect of rattling motion.
- 2009-08-15
著者
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Mori Ikuko
Faculty Of Integrated Arts And Sciences The University Of Tokushima
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FUJITA Takahiro
Department of Chemistry, Faculty of Science, Kanazawa University
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Yoshizawa Masahito
Graduate School Of Frontier Materials Function Engineering Iwate University
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Takegahara Katsuhiko
Graduate School Of Science And Technology Hirosaki University
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Sugawara Hitoshi
Faculty Of Engineering Iwate University
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Suzuki Takashi
Department Of Anatomic Pathology Tohoku University School Of Medicine
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Ishii Isao
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
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Takegahara Katsuhiko
Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561
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Suzuki Takashi
Department of Quantum Matter, ADSM, Hiroshima University, Higashihiroshima, Hiroshima 739-8530
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Mori Ikuko
Faculty of Integrated Arts and Sciences, Tokushima University, Tokushima 770-8502
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Yoshizawa Masahito
Graduate School of Engineering, Iwate University, Morioka 020-8551
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Ishii Isao
Graduate School of Science and Technology, Niigata University, Niigata 950-2181
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Fujita Takahiro
Department of Quantum Matter, ADSM, Hiroshima University, Higashihiroshima, Hiroshima 739-8530
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Sugawara Hitoshi
Faculty of Integrated Arts and Sciences, Tokushima University, Tokushima 770-8502
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