Electroresistance and electronic phase separation in mixed-valent manganites

被引：244

作者：

Wu, T ^{[1
]}

Ogale, SB

Garrison, JE

Nagaraj, B

Biswas, A

Chen, Z

Greene, RL

Ramesh, R

Venkatesan, T

Millis, AJ

机构：

[1] Univ Maryland, Dept Phys, Ctr Superconduct Res, College Pk, MD 20742 USA

[2] Rutgers State Univ, Dept Phys & Astron, Ctr Mat Theory, Piscataway, NJ 08854 USA

[3] Univ Maryland, Dept Mat Sci, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.86.5998

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The sensitivity of transport in colossal magnetoresistance (CMR) manganites to external electric and magnetic fields is examined using field effect configurations with La0.7Ca0.3MnO3 (LCMO), Na0.7Sr0.3MnO3, La0.7Ba0.3MnO3, and La0.5Ca0.5MnO3 (0.5-doped LCMO) channels, and ferroelectric PbZr0.2Ti0.8O3 (PZT) or dielectric (SrTiO3) gates. A large electroresistance (ER) of similar to 76% at 4 X 10(5) V/cm is found in LCMO with PZT-ferroelectric gate, but the magnitude of the effect is much smaller (a few percent) in the other three channels. The ER and CMR effects are remarkably complimentary. The size and systematics of the effect strongly favor a percolative phase separation picture.

引用

页码：5998 / 6001

页数：4

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