Enhanced superconducting fluctuation effects on thermodynamic properties in the BCS-BEC crossover regime

Article

关键词: STRONG-COUPLING SUPERCONDUCTIVITY;    DIAMAGNETIC SUSCEPTIBILITY;    II SUPERCONDUCTORS;    MAGNETIC-FIELD;    TRANSITION;    STATE;    CONDENSATION;    TEMPERATURE;    BEHAVIOR;    FESE;   

DOI  :  10.1103/PhysRevB.96.184507

来源: SCIE

【 摘 要 】

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 B-c2(T). 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).

【 授权许可】

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