Korringa behavior for Cu(2) in YBa2Cu3O6.98

Authors :: J. P. Thiel
Moohee Lee
Kenneth R. Poeppelmeier
U. Welp
Sankar Bhattacharja
Franco D'Orazio
William P Halperin
G. W. Crabtree
N. Tea
Y. Q. Song
M.M. Fang
Source :: Physica B: Condensed Matter. :1301-1302
Publication Year :: 1990
Publisher :: Elsevier BV, 1990.
Abstract: The 63 Cu NMR spin-lattice relaxation rate of YBa 2 Cu 3 O 6.98 (T C =93.3K) at the plane site shows classic Korringa temperature dependence in the normal state with T 1 T=230±20 Kms. This resuit is consistent with Fermi quasi-particle character of the low lying electronic excitations near the Fermi energy. Precursory behavior is observed just above T c in the relaxation data. This may be consistent with order parameter fluctuations.