we report measurements of the magnetic field dependent microwave dissipation at 21 GHz in Bi2Sr2CaCu2O8+x epitaxial films and in oriented YBa2Cu3O7-delta films, by means of the end-wall-replacement cavity technique. The power reflected by the tuned cavity is measured as a function of the external magnetic field H and of the angle theta between H and the (a, b) planes, at fixed temperatures. In Bi2Sr2CaCu2O8+x, apart from a narrow (Delta theta approximate to 0.5 degrees) angular range close to the parallel orientation, the strongly anisotropic dissipation exhibits striking scaling properties: all the data at fixed temperature can be made to collapse on a single curve with a simple angular scaling of the magnetic field: H --> H/f(theta). It is found that the anisotropy ratio f(0 degrees)/f(90 degrees) increases with temperature. It is shown that the scaling function f(theta) and its temperature evolution are in agreement with the model for a quasi-2D superconductor. In YBa2Cu3O7-delta the presence of the flux-flow dissipation prevents the application of a scaling procedure, and a specific model must be applied. We obtain that the anisotropy is almost constant with the temperature, as predicted for a three-dimensional, anisotropic superconductor.

Silva, E., Fastampa, R., Giura, M., Marcon, R., Murtas, F., Sarti, S. (1995). ANISOTROPIC PROPERTIES OF THE MICROWAVE MAGNETO-DISSIPATION IN HIGH-T-C SUPERCONDUCTING FILMS. APPLIED MAGNETIC RESONANCE, 8(1), 11-23 [10.1007/BF03162582].

ANISOTROPIC PROPERTIES OF THE MICROWAVE MAGNETO-DISSIPATION IN HIGH-T-C SUPERCONDUCTING FILMS

SILVA, Enrico;
1995-01-01

Abstract

we report measurements of the magnetic field dependent microwave dissipation at 21 GHz in Bi2Sr2CaCu2O8+x epitaxial films and in oriented YBa2Cu3O7-delta films, by means of the end-wall-replacement cavity technique. The power reflected by the tuned cavity is measured as a function of the external magnetic field H and of the angle theta between H and the (a, b) planes, at fixed temperatures. In Bi2Sr2CaCu2O8+x, apart from a narrow (Delta theta approximate to 0.5 degrees) angular range close to the parallel orientation, the strongly anisotropic dissipation exhibits striking scaling properties: all the data at fixed temperature can be made to collapse on a single curve with a simple angular scaling of the magnetic field: H --> H/f(theta). It is found that the anisotropy ratio f(0 degrees)/f(90 degrees) increases with temperature. It is shown that the scaling function f(theta) and its temperature evolution are in agreement with the model for a quasi-2D superconductor. In YBa2Cu3O7-delta the presence of the flux-flow dissipation prevents the application of a scaling procedure, and a specific model must be applied. We obtain that the anisotropy is almost constant with the temperature, as predicted for a three-dimensional, anisotropic superconductor.
1995
Silva, E., Fastampa, R., Giura, M., Marcon, R., Murtas, F., Sarti, S. (1995). ANISOTROPIC PROPERTIES OF THE MICROWAVE MAGNETO-DISSIPATION IN HIGH-T-C SUPERCONDUCTING FILMS. APPLIED MAGNETIC RESONANCE, 8(1), 11-23 [10.1007/BF03162582].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/120236
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