Room temperature magnetoresistance and cluster-glass behavior in the Tl2-xBixMn2O7 (0≤x≤0.5) pyrochlore series

被引：50

作者：

Alonso, JA ^{[1
]}

Martínez, JL

Martínez-Lope, MJ

Casais, MT

Fernández-Díaz, MT

机构：

[1] CSIC, Inst Ciencia Mat, E-28049 Madrid, Spain

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.82.189

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In a novel Tl2-xBixMn2O7 (0 less than or equal to x less than or equal to 0.5) pyrochlore series magnetoresistance (MR) dramatically increases with Bi substitution: A value of MR at 9 T of 10(4)% is observed for Tl1.8Bi0.2Mn2O7 at 110 K; for Tl1.9Bi0.1Mn2O7 the room temperature MR (9 T) is 10(2)%. Those values are unprecedented in pyrochlorelike manganese oxides, and open up the possibility of technological applications. A cluster-glass state develops, competing with ferromagnetism for x less than or equal to 0.1 and preventing long range ferromagnetic ordering for x greater than or equal to 0.2. A new mechanism for MR at room temperature, associated with polaronic effects, is proposed. [S0031-9007(98)08158-7].

引用

页码：189 / 192

页数：4

共 19 条

[1] Magnetic and electrical properties of Bi1-xSrxMnO3: Hole-doping effect on ferromagnetic perovskite BiMnO3 [J].