Origin of the magnetic susceptibility maximum in CaCu3Ru4O12 and electronic states in the A-site substituted compounds
Origin of the magnetic susceptibility maximum in CaCu3Ru4O12 and electronic states in the A-site substituted compounds
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CaCu3Ru4O12 中磁化率最大值的起源和 A 位取代化合物中的电子态
DOI：
10.1103/physrevb.96.024402
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发表时间：
2017
影响因子：
3.7
通讯作者：
and Hung-Duen Yang
中科院分区：
文献类型：
--
作者：
Ting-Hui Kao;Hiroya Sakurai,Shan Yu;Harukazu Kato;Naohito Tsujii;and Hung-Duen Yang
磁化率随温度的变化在200K左右有一个宽泛的极大值，其来源尚有争议。本研究利用高压合成技术制备了高质量的(A=La，Na，和Sr)样品，解决了这个问题。与以前的报道不同的是，La替代的最大值向较低的温度移动，Na替代的最大值变得不明显，并且受锶替代的影响较小。这一行为强烈地表明，磁化率极大值是由费米能级上方的态密度的尖锐峰值引起的，这导致了强烈的自旋涨落。此外，还讨论了和电子态的性质，前者可能具有近藤性质，后者在约150K以下具有不同来源的自旋涨落。
shows a broad maximum at around 200 K in temperature dependence of magnetic susceptibility, whose origin is under debate. The present study addresses this problem, using high-quality samples of(A = La, Na, and Sr) made by high-pressure synthesis technique. Unlike in a previous report, the maximum shifts to lower temperatures for the La substitution, becomes obscure by the Na substitution, and is less influenced by the Sr substitution. This behavior strongly suggests that the susceptibility maximum is caused by a sharp peak in the density of states just above the Fermi level, which induces strong spin fluctuations. Furthermore, the nature of electronic states ofandare discussed; the former likely bears a Kondo character, and the latter has spin fluctuations of different origin below approximately 150 K.