Calculation of the specific heat for the II-III and II-IV phase transitions in NH4Br

被引：0
|
作者：
Yurtseven, H [1 ]
Mertoglu, A [1 ]
机构：
[1] Istanbul Tech Univ, Dept Phys, TR-80626 Istanbul, Turkey
来源：
CHINESE JOURNAL OF PHYSICS | 2001年 / 39卷 / 04期
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D O I：
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The specific heat C-VI is calculated in this study using the prediction of an Ising model for the II-IV phase transition at 0.05 GPa and for the IMV phase transition at the pressures of 0.19, 0.99 and 2.1 GPa close to TC for the NH4Br crystal. The values of the critical exponent for the specific heat of NH4Br which we determine from our analysis, are close to the predicted values of 1/16 (T < T-C) and 1/8 (T > T-C) obtained from the 3d Ising model. Our calculated specific heat C-VI agrees well with the experimental Cp below TC in the antiferro-ordered (phase III) and ferro-ordered (phase IV) phases of NH4Br. Above T-C (disordered phase II) there occur discrepancies between our calculated C-VI and the observed C-P for NH4Br.
引用
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页码：349 / 356
页数：8
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