Bandwidth narrowing in bulk L(2/3)A(1/3)MnO(3) magnetoresistive oxides

被引：84

作者：

GarciaMunoz, JL

Fontcuberta, J

Suaaidi, M

Obradors, X

机构：

[1] Inst. de Cie. de Mat. de Barcelona, Camp. Univ. Auton. de Barcelona

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1996年 / 8卷 / 50期

关键词：

D O I：

10.1088/0953-8984/8/50/003

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The key structural factor governing the one-electron bandwidth (W) in L(2/3)A(1/3)MnO(3) (A = Ca, Sr) magnetoresistive oxides has been identified by a neutron study. Reducing the size (R(0)) of the lanthanide, the Mn-O bondlength in MnO6 octahedra does not change (d(Mn-0) approximate to 1.960 Angstrom) and hence does not contribute to the narrowing of the sigma(e(g)) conduction bandwidth. In contrast, the Mn-O-Mn angle (theta) bends at a rate d theta/dR(0) = 122.6 Angstrom(-1). The calculation of the bandwidth dependence on theta has been performed and it has been found to be proportional to the measured Curie temperature, both having almost a T-c(theta) approximate to W(theta) approximate to cos(2) theta dependence.

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页码：L787 / L793

页数：7

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