We present measurements of the fluctuational excess conductivity at 48 GHz and 24 GHz in YBa2Cu3O7-delta films above the transition temperature. The measurements depart from the gaussian prediction for finite-frequency fluctuational conductivity. We focus on the region not too close to T-c, where the real part of the excess conductivity drops much faster than the prediction of the gaussian model. We calculate the dynamic excess conductivity within a Ginzburg-Landau approach. In the calculation we insert a short-wavelength cutoff of the order of the inverse coherence length, in order to suppress high-momentum modes. The excess conductivity of all samples measured can be described very well by the modified model.
Silva, E., Marcon, R., Fastampa, R., Giura, M., Sarti, S. (2003). High-frequency fluctuational conductivity in YBa2Cu3O7-delta. JOURNAL OF LOW TEMPERATURE PHYSICS, 131(5-6), 831-835 [10.1023/A:1023479010670].
High-frequency fluctuational conductivity in YBa2Cu3O7-delta
SILVA, Enrico;
2003-01-01
Abstract
We present measurements of the fluctuational excess conductivity at 48 GHz and 24 GHz in YBa2Cu3O7-delta films above the transition temperature. The measurements depart from the gaussian prediction for finite-frequency fluctuational conductivity. We focus on the region not too close to T-c, where the real part of the excess conductivity drops much faster than the prediction of the gaussian model. We calculate the dynamic excess conductivity within a Ginzburg-Landau approach. In the calculation we insert a short-wavelength cutoff of the order of the inverse coherence length, in order to suppress high-momentum modes. The excess conductivity of all samples measured can be described very well by the modified model.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
