ISSN:
1572-9605
Keywords:
Superconductivity
;
fluctuations
;
NMR
;
spin relaxation
;
HighT c
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The effect of superconducting order parameter fluctuations on the nuclear-spin relaxation rate, 1/T 1, is studied for clean two-dimensional systems by calculating the three Maki-Thomson-type diagrams which represent the lowest-order fluctuation contributions to the transverse susceptibility. For Gaussian fluctuations and for temperatures near the mean field transition temperature,T c0, we employ a weak-coupling theory in which the pair-fluctuation propagator can also include pair-breaking effects. We also go beyond the Gaussian theory and take into account the interactions between Cooper-pair fluctuations corresponding to the fourth-order Ginzburg-Landau fluctuation terms. We compare our results with previous results in the dirty limit and in 3D. We obtain a pronounced peak in 1/T1 atT c and briefly discuss possible reasons why this peak is not observed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00728468
Permalink
