Thermopower of single-crystal Nd-1-x(Sr,Pb)(x)MnO3-delta

被引：44

作者：

Crespi, VH ^{[1
]}

Lu, L ^{[1
]}

Jia, YX ^{[1
]}

Khazeni, K ^{[1
]}

Zettl, A ^{[1
]}

Cohen, ML ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720

来源：

PHYSICAL REVIEW B | 1996年 / 53卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.53.14303

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report measurements of the thermopower of the single-crystal manganite perovskite Nd-1-x(Sr,Pb)MnO3-delta from 4.2 to 350 K at zero and finite magnetic field. The sign and magnitude of the thermopower above the magnetic transition are doping dependent. The magnitude of the thermopower drops sharply below the transition to the magnetically ordered state. At lower temperatures the thermopower changes sign from negative to positive with decreasing temperature in the range 100-150 K. Implications for the temperature-dependent electronic structure and scattering processes in this temperature range are discussed. The high-temperature behavior is interpreted within a lattice polaron model. Further analysis suggests a form of variable-range hopping conduction at high temperatures.

引用

页码：14303 / 14308

页数：6