Abstract
Fluctuation-induced corrections to the NMR relaxation rate T −11 in dirty two-dimensional superconductors above the superconducting transition (T>Tc) are re-investigated including dynamic fluctuations. Static fluctuations, as discussed by Kuboki and Fukuyama,1 dominate the fluctuation terms near Tc. We find that dynamic fluctuations become important for T/Tc≳1.05, and might even reverse the sign of the total fluctuation-induced contributions to T −11 . We observe that (T1T)−1 has a minimum at T=Tmin (·) for ·/Tc≳0.1 which depends on the pair-breaking parameter ·. Furthermore, we show that the fluctuation contributions to T −11 can be obtained numerically with very high accuracy from multipoint Padé approximants.
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Heym, J. Effects of superconducting fluctuations on the NMR relaxation rateT −11 of two-dimensional systems aboveT c . J Low Temp Phys 89, 869–884 (1992). https://doi.org/10.1007/BF00683891
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DOI: https://doi.org/10.1007/BF00683891