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)0ex0ex=0ex0exλ(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*0ex0ex=0ex0ex(ξ₀/λ₀)Δ₀~1 K. Possible complications due to impurities, surface quality, and crystal axes orientation are discussed.
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Kosztin et al. (1997) studied this question.
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