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arXiv · cond-mat/9702199

Nonlocal Effects on the Magnetic Penetration Depth in d-wave Superconductors

Ioan Kosztin·Anthony J. Leggett
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Abstract

We show that, under certain conditions, the low temperature behavior of the magnetic penetration depth $λ(T)$ of a pure d-wave superconductor is determined by nonlocal electrodynamics and, contrary to the general belief, the deviation $Δλ(T) = λ(T)-λ(0)$ is proportional to T^2 and not T. We predict that the $Δλ(T)\propto T^2$ dependence, due to nonlocality, should be observable experimentally in nominally clean high-T_c superconductors below a crossover temperature $T^* = (ξ_o/λ_o)Δ_o \sim 1 K$. Possible complications due to impurities, surface quality and crystal axes orientation are discussed.

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Ioan Kosztin, Anthony J. Leggett. 1997-02-21. Nonlocal Effects on the Magnetic Penetration Depth in d-wave Superconductors. https://doi.org/10.1103/physrevlett.79.135

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