Hall-effect sign anomaly and small-polaron conduction in (La1-xGdx)(0.67)Ca0.33MnO3

被引：269

作者：

Jaime, M

Hardner, HT

Salamon, MB

Rubinstein, M

Dorsey, P

Emin, D

机构：

[1] UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801

[2] LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545

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

[4] SANDIA NATL LABS,ALBUQUERQUE,NM 87185

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.78.951

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Hall coefficient of Gd-doped La2/3Ca1/3MnO3 exhibits Arrhenius behavior over a temperature range from 2T(c) to 4T(c), with an activation energy very close to 2/3 that of the electrical conductivity. Although both the doping level and thermoelectric coefficient indicate holelike conduction, the Hall coefficient is electronlike. This unusual result provides strong evidence in favor of small-polaronic conduction in the paramagnetic regime of the manganites.

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页码：951 / 954

页数：4

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