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.

High-frequency fluctuational conductivity in YBa2Cu3O7-delta / E., Silva; R., Marcon; Fastampa, Renato; Giura, Maurizio; Sarti, Stefano; G., Ghigo. - In: JOURNAL OF LOW TEMPERATURE PHYSICS. - ISSN 0022-2291. - STAMPA. - 131:(2003), pp. 831-835. [10.1023/a:1023479010670]

High-frequency fluctuational conductivity in YBa2Cu3O7-delta

FASTAMPA, Renato;GIURA, Maurizio;SARTI, Stefano;
2003

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.
2003
01 Pubblicazione su rivista::01a Articolo in rivista
High-frequency fluctuational conductivity in YBa2Cu3O7-delta / E., Silva; R., Marcon; Fastampa, Renato; Giura, Maurizio; Sarti, Stefano; G., Ghigo. - In: JOURNAL OF LOW TEMPERATURE PHYSICS. - ISSN 0022-2291. - STAMPA. - 131:(2003), pp. 831-835. [10.1023/a:1023479010670]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/248777
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