1999/01/22 by Matthias Eschrig, M. Eschrig, D. Rainer +1 · 4 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.59.12095
published as Phys. Rev. B 59, 12095 (1999) · 21 pages (RevTeX), 22 figures (EPS), submitted to PRB
arxiv created 1999/01/22 · openalex publication_date 1999/05/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present the theory for the effects of superconducting pairing fluctuations on the nuclear spin-lattice relaxation rate 1/T1 and the NMR Knight shift for layered superconductors in high magnetic fields. These results can be used to clarify the origin of the pseudogap in high-Tc cuprates, which has been attributed to spin fluctuations as well as pairing fluctuations. We present theoretical results for s-wave and d-wave pairing fluctuations and show that recent experiments in optimally doped YBa2Cu3O_7\mathrm\ensuremath-\mathrm\ensuremathδ are described by d-wave pairing fluctuations [V. F. Mitrovi\ifmmode \acutec\else 'c\fi et al., Phys. Rev. Lett. 82, 2784 (1999); H. N. Bachman et al. (unpublished)]. In addition, we show that the orthorhombic distortion in YBa2Cu3O_7\mathrm\ensuremath-\mathrm\ensuremathδ accounts for an experimentally observed discrepancy between 1/T1 obtained by nuclear quadrupole resonance and nuclear magnetic resonance at low field. We propose an NMR experiment to distinguish a fluctuating s-wave order parameter from a fluctuating strongly anisotropic order parameter, which may be applied to the system Nd_2\ensuremath-xCexCuO_4\mathrm\ensuremath-\mathrm\ensuremathδ and possibly other layered superconductors.