Is a griffiths phase a prerequisite for colossal magnetoresistance?

被引：158

作者：

Jiang, Wanjun ^{[1
]}

Zhou, XueZhi

Williams, Gwyn

机构：

[1] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

[2] Moscow State Steel & Alloys Inst, Moscow 119049, Russia

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.99.177203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Detailed measurements of the magnetic and transport behavior of the two La-1 - xCaxMnO3 single crystals exhibiting colossal magnetoresistance are summarized. The x = 0: 21 sample exhibits unusual exponents (delta = 20 +/- 1, gamma = 1.71 +/- 0.1, beta = 0.09 +/- 0.01, T-C = 182 +/- 1 K) and, more importantly, a Griffiths phase characterized by an exponent lambda = 0.70 +/- 0.2. By contrast, the x = 0.20 specimen displays Heisenberg model behavior with no evidence of such a phase. Thus while a Griffiths phase accounts for the behavior of La1-xCaxMnO3 near optimal doping, it does not appear to be a prerequisite for colossal magnetoresistance in this system.

引用

页数：4

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