Adiabatic temperature change in perovskite manganites

被引：4

作者：

Biernacki, SW

Schulz, HJ

机构：

[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

[2] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.70.092405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The adiabatic temperature change DeltaT is studied theoretically in perovskite oxides such as La1-xCaxMnO3 crystals. We use a two-parameter phenomenological model which accounts for electron-phonon coupling. The model predicts the linear dependence of DeltaT on magnetic field DeltaH if only the electronic specific heat is accounted for. In order to determine the peak value of DeltaT at T-C it is enough to measure the magnetization vs the magnetic field. The calculated quantities are discussed in the context of various measurements.

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页码：092405 / 1

页数：4

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