超导电性制冷唯象理论  

PHENOMENOLOGICAL THEORY OF REFRIGREATION OF SUPERCONDUCTIVITY

作　　者：单磊[1,2] 王亚芳[1,2] 沙荣钧[1,2] 孙大坤[1,2] 唐玉立[1,2] 陈年林[1,2] 徐小农[1,2] 金新[1,2] 

机构地区：[1]南京大学物理系制冷实验室 [2]中国科技大学结构分析实验室

出　　处：《低温物理学报》1998年第3期179-186,共8页Low Temperature Physical Letters

摘　　要：本文以超导热力学唯象理论为基础，讨论了有退磁效应和无退磁效应的两种Ⅰ类超导体样品在外场从０增加到临界场Ｈｃ（Ｔ）过程中所产生的制冷效应．我们发现：对于有退磁效应的样品，其制冷效应发生在中间态区；而从Ｍｅｉｓｓｎｅｒ态到中间态和从中间态到正常态的相变过程是二级相变，所以无制冷效应．这可能是超导体制冷实验研究的核心问题．Abstract: According to the phenomenological theory of thermodynamics, We discuss respectively the refrigeration of two kind of samples of typel superconductor which are exposed to a slowly increasing magnetic field from 0 to the critical field H c(T) , one has no demagnetization effect, the refrigeration effect exist in the intermediate state but not in the phase transitions from Meissner state to intermediate state and from intermediate state to normal state for the two transitions are the second phase changes, this may be the key problem of experiment in refrigeration of superconductivity.

关 键 词：超导热力学 唯象理论 制冷效应 超导电性 

分 类 号：O511.2[理学—低温物理]