Logarithmic temperature dependence of Sm ion valence in heavy fermion SmxLa1-xOs4Sb12
Logarithmic temperature dependence of Sm ion valence in heavy fermion SmxLa1-xOs4Sb12
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重费米子 SmxLa1-xOs4Sb12 中 Sm 离子价态的对数温度依赖性
DOI：
10.1103/physrevb.92.075118
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Hideyuki Sato and Yuji Aoki
中科院分区：
文献类型：
--
作者：
Kengo Fushiya;Ryoich Miyazaki;Ryuji Higashinaka;Akira Yamada;Masaichiro Mizumaki;Satoshi Tsutsui;Kiyofumi Nitta;Tomoya Uruga;Bunya Suemitsu;Hideyuki Sato and Yuji Aoki
我们测量了边缘的x射线吸收光谱，以研究钐离子的价态，其中在低温下出现场不敏感的重费米子行为。研究发现，随着离子的取代，sm -离子的价移；从10公里开始。对于所有的研究，它的温度依赖性表现出行为，表明价电子的变化是由与电子电荷自由度相关的“非常规近藤效应”引起的。“伴生近藤温度”几乎不受影响，这表明近藤效应具有局地性，这是由于充填的方石的笼状结构造成的。
We have measured x-ray absorption spectra at theedge to investigate the Sm-ion valence of, in which field-insensitive heavy-fermion behavior appears at low temperatures for. It has been found that the Sm-ion valance shifts towith La ion substitution; fromtoat 10 K. For allinvestigated, its temperature dependence shows abehavior, indicating that the valence change is caused by “an unconventional Kondo effect” associated with-electron charge degrees of freedom. Almostindependence of “the associated Kondo temperature”indicates that the Kondo effect has a local nature, attributable to the cage structure of the filled skutterudite.