Simple spin models with non-concave entropies

被引：9
|
作者：
Touchette, Hugo [1 ]
机构：
[1] Queen Mary Univ London, Sch Math Sci, London E1 4NS, England
来源：
AMERICAN JOURNAL OF PHYSICS | 2008年 / 76卷 / 01期
关键词：
D O I：
10.1119/1.2794350
中图分类号：
G40 [教育学];
学科分类号：
040101 ; 120403 ;
摘要：
Two simple spin models are studied to show that the microcanonical entropy can be a non-concave function of the energy, and that the microcanonical and canonical ensembles can give non-equivalent descriptions of the same system in the thermodynamic limit. The two models are simple variations of the classical paramagnetic spin model of non-interacting spins and are solved as easily as the latter model. (C) 2008 American Association of Physics Teachers.
引用
收藏
页码：26 / 30
页数：5
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