arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.12202cond-mat.supr-con
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单能隙与双能隙情形:specific heat和BeAu超导体的热力学临界场

The single- vs. two-gap scenario: the specific heat and the thermodynamic critical field of BeAu superconductor

Rustem Khasanov, Ritu Gupta, Debarchan Das, Andreas Leithe-Jasper, Eteri Svanidze

摘要:

令人困惑的情况下,一些热力学量需要一个单间隙的描述,而另一些需要一个更复杂的间隙的情况下,进行了讨论。我们的方法表明,在某些情况下,仅基于一个热力学量的测量的结论可能会导致相互矛盾的结果。以BeAu超导体为例,在单能隙和双能隙的框架下,重新考虑了电子比热[ $C_{\rm e}(T)$ ]和热力学临界场[ $B_{\rm c}(T)$ ]的温度演化.分析表明,单能隙方法能较好地描述$C_{\rm e}(T)$和超流密度$ρ_{\rm s}(T)$的温度依赖关系.然而,在$B_{\rm c}(T)$的情况下,它失败了。相比之下,自洽的双能隙模型能够通过使用类似的一组参数来描述所有提到的热力学量。我们的结果表明,一个适当的描述的热力学量,超导配对机制,需要使用类似的模型包含相同的参数集。

英文摘要:

The puzzling situation where some thermodynamic quantities require a single-gap description, while others need a more complex gap scenario, is discussed. Our approach reveals that in some cases, the conclusions based on measurements of only one thermodynamic quantity may lead to conflicting results. As an example, temperature evolutions of the electronic specific heat [$C_{\rm e}(T)$] and the thermodynamic critical field [$B_{\rm c}(T)$] of BeAu superconductor were reconsidered within the framework of the single-gap and the two-gap scenarios. The analysis shows that the single-gap approach describes the temperature dependencies of $C_{\rm e}(T)$ and the superfluid density $ρ_{\rm s}(T)$ satisfactorily. However it fails in the case of $B_{\rm c}(T)$. The self-consistent two-gap model, in contrast, is able to describe all of the mentioned thermodynamic quantities by using a similar set of parameters. Our results reveal that a proper description of the thermodynamic quantities, related to the superconducting pairing mechanism, requires the use of similar model containing the same set of parameters.

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