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arXiv · 1603.09069

Crystalline Electric Field and Kondo Effect in SmOs4Sb12

Shota Mombetsu·Tatsuya Yanagisawa·Hiroyuki Hidaka·Hiroshi Amitsuka·Shadi Yasin·Sergei Zherlitsyn·Jochen Wosnitza·Pei-Chun Ho·M. Brian Maple
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Abstract

Our ultrasound results obtained in pulsed magnetic fields show that the filled-skutterudite compound SmOs$_4$Sb$_{12}$ has the $Γ_{67}$ quartet crystalline-electric-field ground state. This fact suggests that the multipolar degrees of freedom of the $Γ_{67}$ quartet play an important role in the unusual physical properties of this material. On the other hand, the elastic response below $\approx$ 20 T cannot be explained using the localized 4$f$-electron model, which does not take into account the Kondo effect or ferromagnetic ordering. The analysis result suggests the presence of a Kondo-like screened state at low magnetic fields and its suppression at high magnetic fields above 20 T even at low temperatures.

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Shota Mombetsu, Tatsuya Yanagisawa, Hiroyuki Hidaka, Hiroshi Amitsuka, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Pei-Chun Ho, M. Brian Maple. 2016-03-30. Crystalline Electric Field and Kondo Effect in SmOs4Sb12. https://doi.org/10.7566/jpsj.85.043704

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