Enhanced superconducting fluctuation effects on thermodynamic properties in the BCS-BEC crossover regime
Enhanced superconducting fluctuation effects on thermodynamic properties in the BCS-BEC crossover regime
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BCS-BEC 交叉区域中超导涨落对热力学性质的增强效应
DOI：
10.1103/physrevb.96.184507
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Ryusuke Ikeda
中科院分区：
文献类型：
--
作者：
Kyosuke Adachi; Ryusuke Ikeda
研究了超导涨落对BCS-BEC交叉区电子系统热力学性质的影响。随着电子之间的吸引相互作用在接近BCS-BEC交叉区域时变得更强，SCF之间的模式耦合的重要性急剧增加。模耦合的增强导致零场超导临界温度和负场的降低。因此，SCF引起的贡献的比热和抗磁磁化率似乎可以超过相应的值在高斯近似。我们讨论了当前结果与在硒化铁（FeSe）中观察到的异常SCF诱导的抗磁响应的相关性。
The effects of superconducting fluctuation (SCF) on the thermodynamic properties of electron systems in the so-called BCS-BEC crossover regime are studied. As the attractive interaction between electrons becomes stronger upon approaching the BCS-BEC crossover regime, the importance of the mode coupling between SCF drastically increases. The enhanced mode coupling leads to lowering of both the zero-field superconducting critical temperature and the depairing field. Consequently, SCF-induced contributions to the specific heat and the diamagnetic susceptibility can seemingly exceed the corresponding values in the Gaussian approximation. We discuss the relevance of the present results to the anomalous SCF-induced diamagnetic response observed in the iron selenide (FeSe).