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Magnetic Penetration Depth Measurements and Inhomogeneity in YBa2Cu3O7−δ Superconducting Thin Films

Published online by Cambridge University Press:  28 February 2011

Steven M. Anlage ,
Brian W. Langley ,
Jurgen Halbritter ,
Chang-Beom Eom ,
Neil Switz ,
T. H. Geballe  and
M. R. Beasley
Steven M. Anlage
Affiliation:
Department of Applied Physics, Stanford University, Stanford, California, 94305, USA
Brian W. Langley
Affiliation:
Department of Applied Physics, Stanford University, Stanford, California, 94305, USA
Jurgen Halbritter
Affiliation:
Kernforschungszentrum Karlsruhe, Postfach 3640, D-7500, Karlsruhe 1, Federal Republic of Germany
Chang-Beom Eom
Affiliation:
Department of Applied Physics, Stanford University, Stanford, California, 94305, USA
Neil Switz
Affiliation:
Department of Applied Physics, Stanford University, Stanford, California, 94305, USA
T. H. Geballe
Affiliation:
Department of Applied Physics, Stanford University, Stanford, California, 94305, USA
M. R. Beasley
Affiliation:
Department of Applied Physics, Stanford University, Stanford, California, 94305, USA
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Abstract

The microstrip resonator technique has been applied to study the temperature dependence of the magnetic penetration depth in high quality YBa2Cu3O7−δ thin films. The temperature dependence at low temperatures comes out directly from measured data, with no assumptions about transmission line geometry, dielectric properties, or a model for the temperature dependence of the penetration depth. One can interpret the data in terms of either an exponential decay of λ(T) at low temperatures or as a power law decay. The energy gaps obtained from the exponential decay at low temperature are found to be significantly smaller than weak coupled BCS theory and power-law exponents are in the range of 1.3 to 3.2. These results will be discussed in terms of microscopic theories and the possibility that materials properties dominate the measurement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 333
Copyright
Copyright © Materials Research Society 1990

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References

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