Two-dimensional charge-transport and spin-valve effect in the layered antiferromagnet Nd0.45Sr0.55MnO3

被引：140

作者：

Kuwahara, H

Okuda, T

Tomioka, Y

Asamitsu, A

Tokura, Y

机构：

[1] Joint Res Ctr Atom Technol, Tsukuba, Ibaraki 3050046, Japan

[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.82.4316

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Below the Neel temperature (T-N) a layered antiferromagnetic (AF) Nd0.45Sr0.55MnO3 crystal is metallic within the ferromagnetic (F) layers (ab plane), while insulating along the AF-coupling direction (c axis), showing an extremely large anisotropy in resistivity. The observed two dimensionality of charge dynamics is due to confinement of the spin-polarized carriers within the F sheets induced by the magnetic ordering as well as orbital ordering (perhaps of d(x2-y2) type). Large negative magnetoresistance is observed over a wide temperature region below T-N, which arises from the dimensional crossover due to the field-induced spin canting in the AF state. [S0031-9007(99)09183-8].

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页码：4316 / 4319

页数：4

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