Nonlocal Effects on the Magnetic Penetration Depth in d-wave Superconductors
Kosztin, Ioan · Leggett, Anthony J.
Original · EN
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 T² and not T. We predict that the Δλ(T)∝ T² dependence, due to nonlocality, should be observable experimentally in nominally clean high-Tc superconductors below a crossover temperature T* = (ξₒ/λₒ)Δₒ 1 K. Possible complications due to impurities, surface quality and crystal axes orientation are discussed.
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