Enhanced superconducting fluctuation effects on thermodynamic properties in the BCS-BEC crossover regime
Kyosuke Adachi, Ryusuke Ikeda
DOI 10.1103/PhysRevB.96.184507 · Physical Review B
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Abstract
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 Bc2(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).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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