First observation for a cuprate superconductor of fluctuation-induced diamagnetism well inside the finite-magnetic-field regime
For the first time for a cuprate superconductor, measurements performed above T(c) in high quality grain aligned La1.9Sr0.1CuO4 samples have allowed the observation of the thermal fluctuation induced diamagnetism well inside the finite-magnetic-field fluctuation regime. These results may be explained in terms of the Gaussian Ginzburg-Landau approach for layered superconductors, but only if the finite field contributions are estimated by taking off the short-wavelength fluctuations.
Carballeira
C
LBTS, Departamento de Fisica da Materia Condensada, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain.
Mosqueira
J
Revcolevschi
A
Vidal
F