Magnetic field dependence of the superconducting fluctuation contribution to NMR-NQR relaxation

Details Magnetic field dependence of the superconducting fluctuation contribution to NMR-NQR relaxation Magnetic field dependence of the superconducting fluctuation contribution to NMR-NQR relaxation

2000-03-07

arxiv.org/abs/cond-mat/0003103v1

Physics

Condensed Matter

Superconductivity

11 pages, 3 figures

Scientific paper

The dependence of the Maki-Thompson (MT) and of the density of states depletion (DOS) contributions from superconducting fluctuations (SF) to NMR-NQR relaxation is derived in the framework of the diagrammatic theory, applied to layered three dimensional (3D) high T_c superconductors. The regularization procedure devised for the conductivity (Buzdin and Varlamov, Phys. Rev. B, 58, 14195 (1998)) is used in order to avoid the divergence of the DOS term. The theoretical results are discussed in the light of NMR-NQR measurements in YBCO and compared with the recent theory (Eschrig et al., Phys. Rev. B 59, 12095 (1999)), based on the assumption of a purely 2D spectrum of fluctuations.

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