High-temperature thermopower in La2/3Ca1/3MnO3 films: Evidence for polaronic transport

被引：370

作者：

Jaime, M ^{[1
]}

Salamon, MB ^{[1
]}

Rubinstein, M ^{[1
]}

Treece, RE ^{[1
]}

Horwitz, JS ^{[1
]}

Chrisey, DB ^{[1
]}

机构：

[1] USN,RES LAB,WASHINGTON,DC 20375

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.54.11914

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermoelectric power, electrical resistivity, and magnetization experiments, performed in the paramagnetic phase of La2/3Ca1/3MnO3, provide evidence for polaron-dominated conduction in colossal magnetoresistance materials. At high temperatures, a large, nearly-field-independent difference between the activation energies for resistivity rho and thermopower S, a characteristic of Holstein polarons, is observed, and Inp ceases to scale with the magnetization. On approaching T-c, both energies become field dependent, indicating that the polarons are magnetically polarized. Below T-c, the thermopower follows a law S(H)similar to 1/rho(H) as in nonsaturated ferromagnetic metals.

引用

页码：11914 / 11917

页数：4

共 23 条

[1]

BLATT FJ, 1976, THERMOELECTRIC POWER, P157

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