Valence-electron transfer and a metal-insulator transition in a strongly correlated perovskite oxide

被引：43

作者：

Ramirez, AP

Lawes, G

Li, D

Subramanian, MA

机构：

[1] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[3] Dupont Cent Res & Dev, Expt Stn, Wilmington, DE 19880 USA

来源：

SOLID STATE COMMUNICATIONS | 2004年 / 131卷 / 3-4期

关键词：

ruthenates; cuprates; metal-insulator transition;

D O I：

10.1016/j.ssc.2004.04.014

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present transport and thermal data for the quadruple-perovskites MCu3(Ti1-xRux)(4)O-12, where 0 < x < 1. A metal-insulator transition (MIT) Occurs for Ru concentrations x similar to 0.75. At the same time, the Cu2+ antiferromagnetic state is destroyed and it's magnetic entropy suppressed by Ru on a 1: 1 basis. This implies that each Ru transfers an electron to a Cu ion and thus the MIT correlates with filling the Cu 3d shell. The Cu spin entropy in this strongly correlated electron material provides a unique probe among MIT systems. (C) 2004 Elsevier Ltd. All rights reserved.

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页码：251 / 255

页数：5

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