Percolative conduction in the half-metallic-ferromagnetic and ferroelectric mixture of (La,Lu,Sr)MnO3 -: art. no. 167206

被引：29

作者：

Park, S ^{[1
]}

Hur, N ^{[1
]}

Guha, S ^{[1
]}

Cheong, SW ^{[1
]}

机构：

[1] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 16期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.92.167206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The immiscibility between rhombohedral La5/8Sr3/8MnO3 and hexagonal LuMnO3 leads to a mum-scale heterogeneous mixture of half-metallic-ferromagnetic and insulating-ferroelectric phases. Electronic conduction of the mixture exhibits nearly ideal percolation behavior in the paramagnetic state with a threshold of 0.224(5) metal volume fraction and a resistivity scaling exponent t=2.1+/-0.1, consistent with the predicted universal behavior of classical percolation. However, far below T-C, t increases to 2.4+/-0.1, probably resulting from intergrain tunneling. Therefore, this system represents a unique example of the temperature-induced crossover from universal to nonuniversal behavior of t.

引用

页码：167206 / 1

页数：4

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