Novel Metallic State Carrying Localized Spins in the Molecular Conductor(DMET)2FeBr4
Novel Metallic State Carrying Localized Spins in the Molecular Conductor(DMET)2FeBr4
复制标题
分子导体(DMET)2FeBr4中携带局域自旋的新型金属态
DOI：
10.1103/physrevlett.81.3719
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发表时间：
1998
影响因子：
8.6
通讯作者：
K. Kikuchi
中科院分区：
文献类型：
--
作者：
T. Enoki;T. Umeyama;A. Miyazaki;H. Nishikawa;I. Ikemoto;K. Kikuchi
在T c=200K时经历金属-绝缘体转变的(DMET) 2 FeBr 4 具有DMET施主导电片和FeBr 4 磁性片的交替堆叠结构。在 T c 以上，它处于准一维四分之一填充金属状态，其中居里-韦斯型磁性用 DMET+ 供体自旋和 Fe 3+ 自旋来描述。低于 T c 时，磁性仅受 Fe 3+ 自旋控制，在 T N= 3.5 K 时显示出反铁磁序。高于 T c 的 π 载流子的局域自旋特征与金属传导相矛盾，可以根据维格纳晶格态的滑动运动得到很好的理解。
(DMET) 2 FeBr 4 which undergoes a metal-insulator transition at T c= 200 K has an alternating stacked structure of DMET donor conducting sheets and FeBr 4 magnetic sheets. Above T c it is in a quasi-1D quarter-filled metallic state, where the Curie-Weiss type magnetism is described in terms of DMET+ donor spins and Fe 3+ spins. Below T c the magnetism, governed only by Fe 3+ spins, shows antiferromagnetic order at T N= 3.5 K. The localized spin feature of π carriers above T c, which contradicts metallic conduction, is reasonably well understood in terms of the sliding motion of a Wigner lattice state.