On the nature of grain boundaries in the colossal magnetoresistance manganites

被引：117

作者：

Klein, J ^{[1
]}

Höffner, C ^{[1
]}

Uhlenbruck, S ^{[1
]}

Alff, L ^{[1
]}

Büchner, B ^{[1
]}

Gross, R ^{[1
]}

机构：

[1] Univ Cologne, Inst Phys 2, D-59037 Cologne, Germany

来源：

EUROPHYSICS LETTERS | 1999年 / 47卷 / 03期

关键词：

D O I：

10.1209/epl/i1999-00398-1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electrical transport properties of grain boundaries in the epitaxial La2/3Ca1/3MnO3-delta thin films have been studied as a function of temperature and applied magnetic field. Below the Curie temperature T-C an additional grain boundary resistance, highly non-linear current-voltage curves, and a large magnetoresistive effect in the whole temperature regime below T-C are found. The results can be explained consistently by the presence of a disordered, a few nm wide paramagnetic grain boundary layer that is depleted below T-C due to an increase of the work function of the ferromagnetic grain material adjacent to this layer. The related band bending and space charge effects are important for the physics of grain boundaries in the manganites.

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页码：371 / 377

页数：7

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