Onset Temperatures for Superconducting Fluctuations in Te-annealed FeTe1−xSex Single Crystals: Evidence for the BCS–BEC Crossover

Uezono, Yu; Otsuka, Takumi; Hagisawa, Shotaro; Taniguchi, Haruka; Matsukawa, Michiaki; Fujii, Toshitsugu; Watanabe, Tetsu

doi:10.7566/jpscp.38.011023

Proceedings of the 29th International Conference on Low Temperature Physics (LT29) 2023

DOI: 10.7566/jpscp.38.011023

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Onset Temperatures for Superconducting Fluctuations in Te-annealed FeTe₁₋_xSe_x Single Crystals: Evidence for the BCS–BEC Crossover

Yu Uezono

Takumi Otsuka

Shotaro Hagisawa

et al.

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Absence of a BCS-BEC crossover in the cuprate superconductors

Sous

Kivelson

2023

npj Quantum Mater.

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We examine key aspects of the theory of the Bardeen–Cooper–Schrieffer (BCS) to Bose–Einstein condensation (BEC) crossover, focusing on the temperature dependence of the chemical potential, μ. We identify an accurate method of determining the change of μ in the cuprate high temperature superconductors from angle-resolved-photoemission data (along the ‘nodal’ direction), and show that μ varies by less than a few percent of the Fermi energy over a range of temperatures from far below to several times above the superconducting transition temperature, Tc. This shows, unambiguously, that not only are these materials always on the BCS side of the crossover (which is a phase transition in the d-wave case), but are nowhere near the point of the crossover (where the chemical potential approaches the band bottom).

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Absence of a BCS-BEC crossover in the cuprate superconductors

Sous

Kivelson

2023

npj Quantum Mater.

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Onset Temperatures for Superconducting Fluctuations in Te-annealed FeTe₁₋_xSe_x Single Crystals: Evidence for the BCS–BEC Crossover

Cited by 1 publication

References 21 publications

Absence of a BCS-BEC crossover in the cuprate superconductors

Absence of a BCS-BEC crossover in the cuprate superconductors

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