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arXiv 2006.14931math-phcond-mat.stat-mechcond-mat.supr-conmath.APmath.MP
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BCS-Bogoliubov超导模型中specific heat和临界磁场的算符理论研究

An operator-theoretical study of the specific heat and the critical magnetic field in the BCS-Bogoliubov model of superconductivity

Shuji Watanabe

摘要:

在前文中,作者在不动点定理的基础上,引入一个截止点,证明了BCS-Bogoliubov超导模型中向超导态的转变是二级相变,并从算子理论的观点解决了长期存在的二级相变问题。本文从算子理论的观点出发,研究了该模型中比热和临界磁场的温度依赖性。首先给出了BCS-Bogoliubov能隙方程解关于温度的一些性质,并给出了比热除以比热的能隙的精确显式表达式.然后,我们表明,它不依赖于超导体,是一个普遍的常数。此外,我们还证明了临界磁场随温度的变化是光滑的,并指出了临界磁场及其导数的行为。

英文摘要:

In the preceding paper, introducing a cutoff, the present author gave a proof of the statement that the transition to a superconducting state is a second-order phase transition in the BCS-Bogoliubov model of superconductivity on the basis of fixed-point theorems, and solved the long-standing problem of the second-order phase transition from the viewpoint of operator theory. In this paper we study the temperature dependence of the specific heat and the critical magnetic field in the model from the viewpoint of operator theory. We first show some properties of the solution to the BCS-Bogoliubov gap equation with respect to the temperature, and give the exact and explicit expression for the gap in the specific heat divided by the specific heat. We then show that it does not depend on superconductors and is a universal constant. Moreover, we show that the critical magnetic field is smooth with respect to the temperature, and point out the behavior of both the critical magnetic field and its derivative.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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