EFFECTS OF SUPERCONDUCTING FLUCTUATIONS ON THE NMR RELAXATION RATE T(1)(-1) OF 2-DIMENSIONAL SYSTEMS ABOVE T(C)

被引:16
作者
HEYM, J
机构
[1] Physikalisches Institut, Universität Bayreuth, Bayreuth
关键词
D O I
10.1007/BF00683891
中图分类号
O59 [应用物理学];
学科分类号
摘要
Fluctuation-induced corrections to the NMR relaxation rate T1(-1) in dirty two-dimensional superconductors above the superconducting transition (T> T(c)) are re-investigated including dynamic fluctuations. Static fluctuations, as discussed by Kuboki and Fukuyama,1 dominate the fluctuation terms near T(c). We find that dynamic fluctuations become important for T/T(c) greater than or similar to 1.05, and might even reverse the sign of the total fluctuation-induced contributions to T1(-1). We observe that (T1T)-1 has a minimum at T = T(min) (delta) for delta/T(c) greater than or similar to 0. 1 which depends on the pair-breaking parameter delta. Furthermore, we show that the fluctuation contributions to T1(-1) can be obtained numerically with very high accuracy from multipoint Pade approximants.
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页码:869 / 884
页数:16
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