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Measurements of chemical potentials in superconducting tin whiskers

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Abstract

A superconductor / normal conductor potential probe pair was used to measure differences between the time-averaged electrochemical potentials 〈μ p 〉 of Cooper pairs and 〈μ〉 of quasiparticle excitations caused by a phase-slip center in several experimental situations. The results can only be understood by assuming that at a larger distance from the phase-slip center 〈μ〉 differs from the proposal of Skocpol, Beasley, and Tinkham by showing a “swinging over” or “swinging below” 〈μ p 〉. We propose a modified slope of 〈μ〉 as a function of site. Possible explanations are discussed. The multiple-contact samples used also allow the study of the influence of phase-slip centers already present on the relaxation of nonequilibrium quasiparticles.

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Tidecks, R. Measurements of chemical potentials in superconducting tin whiskers. J Low Temp Phys 58, 233–263 (1985). https://doi.org/10.1007/BF00681305

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Keywords

  • Magnetic Material
  • Large Distance
  • Experimental Situation
  • Cooper Pair
  • Electrochemical Potential