Inhomogeneous magnetic-field response of YBa2Cu3Oy and La2-xSrxCuO4 persisting above the bulk superconducting transition temperature.
We report that in YBa2Cu3Oy and La2-xSrxCuO4 there is a spatially inhomogeneous response to the magnetic field for temperatures T extending well above the bulk-superconducting transition temperature Tc. An inhomogeneous magnetic response is observed above Tc even in ortho-II YBa2Cu3O6.50, which has highly ordered doping. The degree of the field inhomogeneity above Tc tracks the hole-doping dependences of both Tc and the density of the superconducting carriers below Tc, and therefore is apparently coupled to superconductivity.
Sonier
J E
JE
Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
Ilton
M
M
Pacradouni
V
V
Kaiser
C V
CV
Sabok-Sayr
S A
SA
Ando
Y
Y
Komiya
S
S
Hardy
W N
WN
Bonn
D A
DA
Liang
R
R
Atkinson
W A
WA