Millimeter-wave complex conductivity of some epitaxialYBa2Cu3O7−δfilms
| Autor: | P. H. Kobrin, P. J. Hood, William F. Hall, Alan B. Harker, I.S. Gergis, William W. Ho |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Superconductivity
chemistry.chemical_classification Materials science Condensed matter physics Conductivity BCS theory Condensed Matter::Materials Science Surface conductivity chemistry Electrical resistivity and conductivity Condensed Matter::Superconductivity Penetration depth Inorganic compound Sheet resistance |
| Zdroj: | Physical Review B. 42:6259-6263 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.42.6259 |
| Popis: | The first complex conductivities ({sigma}{sup *}) of epitaxial and partly oriented Y-Ba-Cu-O films have been measured at 60 GHz. For the epitaxial films, the real part of the conductivity, {sigma}{sub 1}, shows a maximum just below the superconducting transition. The qualitative behavior of {sigma}{sup *} is not consistent with classical BCS calculations for a homogeneous superconducting film. Large variations in the temperature dependence of {sigma}{sup *} among these films suggest that they are mixtures of normal and superconducting regions. A surface resistance of 10{sup {minus}3} {Omega} at 38 K and a penetration depth of 0.4 {mu}m at 55 K have been determined. |
| Databáze: | OpenAIRE |
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