Nonlocal effects on the magnetic penetration depth in d-wave superconductors

Nonlocal effects on the magnetic penetration depth in d-wave superconductors
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DOI:
10.1103/physrevlett.79.135
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发表时间:
1997-07-07
影响因子:
8.6
通讯作者:
Leggett, AJ
Leggett, AJ
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Kosztin, I;Leggett, AJ

文献摘要

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我们证明,在一定条件下,纯d波超导体的磁穿透深度λ(Tau)的低温行为是由非定域电动力学决定的,并且与一般观点相反,偏差Δ λ(Tau)= λ(Tau)-λ(0)与Tau(2)而不是Tau成正比。我们预测,由于非局域性,在名义上干净的高Tau(c)超导体中,在交叉温度Tau(*)=(zeta(0)/lambda(0))Delta(0)类似于1 K的情况下,应该可以通过实验观察到Delta lambda(Tau)α Tau(2)依赖性。由于杂质,表面质量和晶轴取向可能的并发症进行了讨论。
We show that, under certain conditions, the low temperature behavior of the magnetic penetration depth lambda(Tau) of a pure d-wave superconductor is determined by nonlocal electrodynamics and, contrary to the general belief, the deviation Delta lambda(Tau) = lambda(Tau)- lambda(0) is proportional to Tau(2) and not Tau. We predict that the Delta lambda(Tau) alpha Tau(2) dependence, due to nonlocality, should be observable experimentally in nominally clean high-Tau(c), superconductors below a crossover temperature Tau(*) = (zeta(0)/lambda(0))Delta(0) similar to 1 K. Possible complications due to impurities, surface quality, and crystal axes orientation are discussed.