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Low-lying excitations at the rare-earth site due to the rattling motion in the filled skutterudite LaOs4Sb12 revealed by La139 NMR and Sb121123 NQR

Yusuke Nakai, Kenji Ishida, Hitoshi Sugawara, Daisuke Kikuchi, and Hideyuki Sato
Phys. Rev. B 77, 041101(R) – Published 8 January 2008

Abstract

We report experimental results of nuclear magnetic resonance (NMR) at the La site and nuclear quadrupole resonance (NQR) at the Sb site in the filled skutterudite LaOs4Sb12. We found that the nuclear spin-lattice relaxation rate divided by temperature 1T1T at the La site exhibits a different temperature dependence from that at the Sb site. Although 1T1T at the Sb site is explained by the Korringa mechanism, 1T1T at the La site exhibits a broad maximum around 50K, showing the presence of an additional contribution at the La site. The additional low-lying excitations observed at the La site can be understood with the relaxation from anharmonic phonons due to the rattling motion of the La atoms.

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  • Received 5 November 2007

DOI:https://doi.org/10.1103/PhysRevB.77.041101

©2008 American Physical Society

Authors & Affiliations

Yusuke Nakai1,*, Kenji Ishida1, Hitoshi Sugawara2, Daisuke Kikuchi3, and Hideyuki Sato3

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 2Faculty of Integrated Arts and Sciences, University of Tokushima, Tokushima 770-8502, Japan
  • 3Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

  • *nakai@scphys.kyoto-u.ac.jp

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Vol. 77, Iss. 4 — 15 January 2008

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