ELECTRON LOCALIZATION IN MIXED-VALENCE MANGANITES

被引:518
作者
COEY, JMD [1 ]
VIRET, M [1 ]
RANNO, L [1 ]
OUNADJELA, K [1 ]
机构
[1] INST PHYS & CHIM MAT STRASBOURG,F-67037 STRASBOURG,FRANCE
关键词
D O I
10.1103/PhysRevLett.75.3910
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Mixed-valence manganites (A(0.7)(3+)B(0.3)(2+))MnO3 exhibit a resistivity peak with giant negative magnetoresistance below the Curie point. Residual resistivity ranges from 5 X 10(-8) to 8 X 10(3) Omega m, but the electronic heat capacity when A = Y or La is that of a normal d-band metal; y approximate to 6 mJ mole(-1) K-2 Spatial fluctuations in the Coulomb and spin-dependent potentials localize the e(g) up arrow (sigma*) electrons in wave packets that are large on the scale of the Mn-Mn separation. Transport in the magnetically localized state involves zero-point-energy assisted hopping or tunneling of electrons from one weakly localized wave packet to another.
引用
收藏
页码:3910 / 3913
页数:4
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