Magnetocaloric Effect in Sm0.55Sr0.45MnO3 Manganite

被引：0

作者：

Zashchirinskii, D. ^{[1
]}

Morozov, A. ^{[1
]}

Koroleva, L. I. ^{[1
]}

Balbashov, A. ^{[2
]}

机构：

[1] Moscow MV Lomonosov State Univ, Moscow 119992, Russia

[2] Mascow Power Engn Inst, Moscow 119992, Russia

来源：

TRENDS IN MAGNETISM | 2011年 / 168-169卷

关键词：

magnetocaloric effect; manganite; magnetic clusters; Curie temperature; paramagnetic susceptibility;

D O I：

10.4028/www.scientific.net/SSP.168-169.373

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetocaloric effect (Delta T-effect) was studied by direct method on three samples of Sm0.55Sr0.45MnO3 manganite: ceramic (C) sample and two single crystals, annealed in oxygen (O) or in air atmosphere (A). The temperature dependence of Delta T-effect Delta T(T) of all the samples has maximum at T-max equal to 143.3 K for A-sample, 244 K for O-sample, and 143 K for C-sample. In these maxima Delta T values are 0.8 K, 0.41 K, and 0.4 K for A-, O- and C-samples respectively. In addition, the Delta T(T) curve of A-sample has minimum at T-min = 120 K and Delta T-value in minimum is equal to - 0.1 K. The maximum value of Delta T-effect increases with H up to the maximum field of measurement 14.2 kOe. When this takes place the rate of this increasing is higher at H > 8 kOe than at H < 8 kOe. The above listed peculiarities of Delta T-effect are explained by the presence in the samples of ferromagnetic, antiferromagnetic A-type and antiferromagnetic CE-type clusters.

引用

页码：373 / +

页数：2