Ultrasonic dispersion in all elastic moduli and softening at low temperatures in filled skutterudite LaFe4Sb12

• Ishii Isao

  Graduate School of Science and Technology, Niigata University

• Fujita Takahiro

  Department of Quantum Matter, ADSM, Hiroshima University

• Mori Ikuko

  Faculty of Integrated Arts and Sciences, Tokushima University

• Sugawara Hitoshi

  Faculty of Integrated Arts and Sciences, Tokushima University

• Yoshizawa Masahito

  Graduate School of Engineering, Iwate University

• Takegahara Katsuhiko

  Graduate School of Science and Technology, Hirosaki University

• Suzuki Takashi

  Department of Quantum Matter, ADSM, Hiroshima University

書誌事項

タイトル別名

• Ultrasonic Dispersion in All Elastic Moduli and Softening at Low Temperatures in Filled Skutterudite LaFe<SUB>4</SUB>Sb<SUB>12</SUB>

抄録

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.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 78 (8), 084601-084601, 2009

  一般社団法人 日本物理学会

キーワード

• large amplitude atomic motion
• filled skutterudite
• elastic modulus
• ultrasonic dispersion
• elastic softening

詳細情報

• CRID: 1390001204197344256
• NII論文ID: 130005437858
• NII論文ID: 40016692850
• NII論文ID: 210000107927
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.78.084601
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 10317083
• Web Site: http://id.ndl.go.jp/bib/10317083
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10317083
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.78.084601
• 本文言語コード: en
• データソース種別:
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