Magnetocaloric effect and heat capacity in the phase-transition region

被引：125

作者：

Tishin, AM

Gschneidner, KA

Pecharsky, VK ^{[1
]}

机构：

[1] Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA

[2] Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA

[3] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119899, Russia

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.59.503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The behavior of the magnetic-field and temperature-dependent heat capacity C(H,T) and the magnetocaloric effect Delta T(Delta H,T), in the vicinity of magnetic phase transitions is discussed. A simple model allowing calculation of the peak value of the magnetocaloric effect is developed from general principles of thermodynamics. It is shown that a characteristic temperature Theta(H) where the heat capacity of the magnetic material is independent of the magnetic field, can be defined. The peak value (maximum or minimum) of the magnetocaloric effect occurs near the Theta(H). Both Theta(H) and peak value of the magnetocaloric effect approach the magnetic ordering temperature. Experimental measurements of the heat capacity and the magnetocaloric effect of several high-purity lanthanide magnetic materials agree well the theoretical model. [S0163-1829(99)07101-5].

引用

页码：503 / 511

页数：9