DC and microwave fluctuational conductivity of anisotropic superconductors

We present measurements of the dc and microwave excess conductivity above Tc in anisotropic superconducting cuprates and MgB2. When temperature raises well above Tc, both the dc and microwave excess conductivities drop much faster than predicted by the well-established Gaussian theory. We introduce...

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Bibliographic Details
Published inPhysica. C, Superconductivity Vol. 388-389; pp. 149 - 150
Main Authors Silva, E., Marcon, R., Fastampa, R., Giura, M., Sarti, S.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2003
Subjects
Cuprates
Fluctuations
MgB2
Paraconductivity
Fluctuations
Paraconductivity
MgB2
Cuprates
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Summary:We present measurements of the dc and microwave excess conductivity above Tc in anisotropic superconducting cuprates and MgB2. When temperature raises well above Tc, 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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(02)02689-8