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Flux Lattice Melting in Amorphous Composite IN/INOx Thin Film Superconductors

  • P. L. Gammel
  • A. F. Hebard
  • D. J. Bishop

Abstract

The mechanical response, comprising longitudinal sound velocity and damping, of amorphous In/InOx films is studied as a function of normal state sheet resistance. The films are sputtered directly onto a high Q oscillator fabricated from single crystal silicon. With a resonant frequency near 3 KHz, the oscillators have Q’s of 105 and a frequency stability of 10-8. This allows for a unique measurement of the dynamics of magnetic vortices, induced by a field perpendicular to the plane of the sample. The melting of the vortex lattice is signaled by a peak in the attenuation and a frequency shift of the silicon oscillator. The zero field melting temperature and the magnitude of the frequency shift are described by a model of Kosterlitz-Thouless melting due to D.S. Fisher. The temperature dependence of the melting does not agree with this calculation.

Keywords

Shear Modulus Resonant Frequency Frequency Shift Sheet Resistance Vortex Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • P. L. Gammel
    • 1
  • A. F. Hebard
    • 1
  • D. J. Bishop
    • 1
  1. 1.AT&T Bell LaboratoriesMurray HillUSA

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