We present measurements of the dc and microwave excess conductivity above T-c in anisotropic superconducting cuprates and MgB2. When temperature raises well above T-c, both the dc and microwave excess conductivities drop much faster than predicted by the well-established Gaussian theory. We introduce a spectral cutoff in the calculation of the finite-frequency fluctuational conductivity in order to suppress the contribution of high-momentum modes at high temperatures. We find that our data are well described by the model for appropriate dimensionalities. (C) 2003 Elsevier Science B.V. All rights reserved.
DC and microwave fluctuational conductivity of anisotropic superconductors / E., Silva; Fastampa, Renato; Giura, Maurizio; Sarti, Stefano. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - STAMPA. - 388:(2003), pp. 149-150. (Intervento presentato al convegno 23rd International Conference on Low Temperature Physics (LT23) tenutosi a HIROSHIMA, JAPAN nel AUG 20-27, 2002) [10.1016/s0921-4534(02)02689-8].
DC and microwave fluctuational conductivity of anisotropic superconductors
FASTAMPA, Renato;GIURA, Maurizio;SARTI, Stefano
2003
Abstract
We present measurements of the dc and microwave excess conductivity above T-c in anisotropic superconducting cuprates and MgB2. When temperature raises well above T-c, both the dc and microwave excess conductivities drop much faster than predicted by the well-established Gaussian theory. We introduce a spectral cutoff in the calculation of the finite-frequency fluctuational conductivity in order to suppress the contribution of high-momentum modes at high temperatures. We find that our data are well described by the model for appropriate dimensionalities. (C) 2003 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
