Magnetoresistance in Mn pyrochlore: Electrical transport in a low carrier density ferromagnet

被引：94

作者：

Majumdar, P ^{[1
]}

Littlewood, P ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.81.1314

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We discuss magnetotransport in a low density electron gas coupled to spin fluctuations near and above a ferromagnetic transition. Provided the density is low enough [n less than or similar to 1/xi(3)(T), with xi(T) the ferromagnetic correlation length], spin polarons form in an intermediate temperature regime above T-c. Both in the spin polaron regime and in the itinerant regime nearer T-c, the magnetoresistance is large. We propose that this provides a good model for "colossal" magnetoresistance in the pyrochlore Tl2-xScxMn2O7, fundamentally different from the mechanism in the perovskite manganites such as La1-xSrxMnO3.

引用

页码：1314 / 1317

页数：4

共 21 条

[1] MAGNETORESISTANCE IN MAGNETIC MANGANESE OXIDE WITH INTRINSIC ANTIFERROMAGNETIC SPIN STRUCTURE [J].