Magnetocaloric effect in a La0.7Ca0.3MnO3 single crystal

被引：76

作者：

Tian, SB

Phan, MH

Yu, SC ^{[1
]}

Hur, NH

机构：

[1] Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea

[2] Korea Res Stand & Sci, Ctr CMR Mat, Taejon 305600, South Korea

来源：

PHYSICA B-CONDENSED MATTER | 2003年 / 327卷 / 2-4期

关键词：

entropy; magnetocaloric effect; magnetic refrigeration; single crystal; double-exchange;

D O I：

10.1016/S0921-4526(02)01733-7

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A large entropy change in a single crystal of La0.7Ca0.3MnO3, which undergoes a first-order ferromagnetic to paramagnetic transition at 227 K, was observed. As a result of a sharp drop in magnetization associated with ferromagnetic-paramagnetic transition, the magnetic entropy change, DeltaS(M), reaches a maximum value of about 6.42 J/kg K for an applied field of 5 T. The DeltaS(M) distribution here is much more uniform than that of pure Gd metal, which is desirable for an Ericson-cycle magnetic refrigerator. Through these results, the La0.7Ca0.3MnO3 single crystal is strongly recommended to use as an active magnetic refrigerant for magnetic refrigerators. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：221 / 224

页数：4

共 13 条

[1] ON A GENERALISED APPROACH TO 1ST AND 2ND ORDER MAGNETIC TRANSITIONS [J].