Phys. Rev. Lett. 79, 135–138 (1997)Nonlocal Effects on the Magnetic Penetration Depth in d-Wave SuperconductorsReceived 21 February 1997; published in the issue dated 7 July 1997 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* = (ξ0/λ0)Δ0∼1 K. Possible complications due to impurities, surface quality, and crystal axes orientation are discussed. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.135
DOI:
10.1103/PhysRevLett.79.135
PACS:
74.25.Nf, 74.20.Fg, 74.72.Bk
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