First-order transition from a Kondo insulator to a ferromagnetic metal in single crystalline FeSi(1-x)Ge(x).
First-order transition from a Kondo insulator to a ferromagnetic metal in single crystalline FeSi(1-x)Ge(x).
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DOI：
10.1103/physrevlett.91.046401
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发表时间：
2003-02
影响因子：
8.6
通讯作者：
S. Yeo;S. Nakatsuji;A. Bianchi;P. Schlottmann;Z. Fisk;L. Balicas;Stampe Pa;Kennedy Rj
中科院分区：
文献类型：
--
作者：
S. Yeo;S. Nakatsuji;A. Bianchi;P. Schlottmann;Z. Fisk;L. Balicas;Stampe Pa;Kennedy Rj
通过对单晶的磁性、热学和输运测量获得的FeSi（1-x）Ge（x）的相图显示了从近藤绝缘体到铁磁金属的不连续转变，其中x处于临界浓度，x（c）约为0.25。绝缘相的差距随x强烈减小。比热γ系数似乎跟踪近藤绝缘体的态密度。的相图是一致的绝缘体-金属过渡诱导的减少与X的杂化结合在Si/Ge配位体网站上的无序。
The phase diagram of FeSi(1-x)Ge(x), obtained from magnetic, thermal, and transport measurements on single crystals, shows a discontinuous transition from Kondo insulator to ferromagnetic metal with x at a critical concentration, x(c) approximately 0.25. The gap of the insulating phase strongly decreases with x. The specific heat gamma coefficient appears to track the density of states of a Kondo insulator. The phase diagram is consistent with an insulator-metal transition induced by a reduction of the hybridization with x in conjunction with disorder on the Si/Ge ligand site.