Return to index
Author:
Matthias Eschrig, D. Rainer and J. A. Sauls
Comments:
21 pages with 22 figures
Journals:
Physical Review B 59, 12095 (1999)
[DOI]
[PDF]
Abstract:
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-d}
are described by d-wave pairing fluctuations.
In addition, we show that the orthorhombic distortion in
YBa2Cu3O{7-d}
accounts for an experimentally observed discrepancy between
1/T1
obtained
by NQR and NMR 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
Nd2-xCexCuO{4-d}
and possibly other layered superconductors.
Return to index