Abstract
The influence of short inelastic lifetimes due to strong coupling of fermionic quasiparticles to bosons on superconducting fluctuation effects aboveT c is calculated. Considering a strong-coupling model for a layered superconducting metal, it is shown that pairing fluctuation corrections to the spin-lattice relaxation rate in weak coupling and very strong coupling are qualitatively different if the pairing fluctuation spectrum has s-wave symmetry. For weak coupling the corrections are positive, whereas for very strong coupling γ = 2ƒ d ω α2 F(ω)/ω > 2 the corrections are negative. In contrast, the Pauli spin susceptibility is insensitive to strong-coupling corrections.
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Eschrig, M. Effects of strong coupling on pairing fluctuations in layered superconductors. Appl. Magn. Reson. 19, 321–328 (2000). https://doi.org/10.1007/BF03162373
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DOI: https://doi.org/10.1007/BF03162373