We present measurements of the (a, b) plane excess conductivity Delta sigma in several Bi2Sr2CaCu2O8+x single crystals through a multiterminal technique. We find that the measured aa do not show an universal behaviour. We discuss this data in terms of Gaussian fluctuations in a nearly-two-dimensional superconductor above Tc, introducing a phenomenological cutoff in the fluctuative spectrum. All our data follow the extended theory up to T approximate to 1.3T(c). While the resulting cutoff differs from sample to sample, the numerical values of the cutoff are always in the expected range o(xi (-1)).
Silva, E., Neri, D., Esposito, M., Fastampa, R., Giura, M., Sarti, S. (2000). Excess conductivity in Bi2Sr2CaCu2O8+x crystals: effects of a short-wavelength cutoff. PHYSICA. C, SUPERCONDUCTIVITY, 341, 1927-1928 [10.1016/S0921-4534(00)01386-1].
Excess conductivity in Bi2Sr2CaCu2O8+x crystals: effects of a short-wavelength cutoff
SILVA, Enrico;
2000-01-01
Abstract
We present measurements of the (a, b) plane excess conductivity Delta sigma in several Bi2Sr2CaCu2O8+x single crystals through a multiterminal technique. We find that the measured aa do not show an universal behaviour. We discuss this data in terms of Gaussian fluctuations in a nearly-two-dimensional superconductor above Tc, introducing a phenomenological cutoff in the fluctuative spectrum. All our data follow the extended theory up to T approximate to 1.3T(c). While the resulting cutoff differs from sample to sample, the numerical values of the cutoff are always in the expected range o(xi (-1)).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.