Crystal structure, magnetic and transport properties, and electronic and structure of colossal magnetoresistance Tl2Mn2O7 pyrochlore

被引：14

作者：

Shimakawa, Y ^{[1
]}

Kubo, Y ^{[1
]}

机构：

[1] NEC Corp Ltd, Fundamental Res Labs, Tsukuba, Ibaraki 3058501, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 1999年 / 63卷 / 1-2期

关键词：

pyrochlore Tl2Mn2O7; colossal magnetoresistance; hybridized band structure; spin-polarized electron conduction;

D O I：

10.1016/S0921-5107(99)00050-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A thallium-manganese pyrochlore, TI2Mn2O7, shows magnetotransport properties including a colossal magnetoresistance (CMR) quite similar to those observed in the hole-doped perovskite manganese oxides. The pyrochlore material, however, differs both structurally and electronically from the perovskites. Neither Zener's double-exchange nor the phonon-mediated mechanism, which is usually applied to the perovskite compounds, seems to explain the CMR in the pyrochlore. A distinctive electronic band structure, in which a hybridized band of Tl(6s)-O(2p)-Mn(3d) plays an essential role in magnetic and transport properties, is described. The CMR mechanism for Tl2Mn2O7 is discussed in terms of a drastic change in the electronic band structure. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：44 / 48

页数：5

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