Anomalous voltage noise at the superconducting transition of tin films

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Abstract

We report voltage noise studies in the superconducting transition of thin Tin (Sn) films. Voltage noises are measured as a function of temperature and ac current. The noise spectral power S 1/2 strongly depends on the temperature and current, with the peak temperature in S 1/2 shifted down from that of dR/dT. Comparison with the dc noise measurement shows the S 1/2 is much larger with ac current than dc. I-V characteristics and voltage noises are measured simultaneously to reveal the nature of the excess noises. The noise dependence on voltage strongly suggests the nature of vortex shot noise with a characteristic √V dependence for small V and reduction of S 1/2 due to strong correlation of vortices at large V.

Original languageEnglish (US)
Pages (from-to)206-210
Number of pages5
JournalJournal of Low Temperature Physics
Volume151
Issue number1-2 PART 1
DOIs
StatePublished - Apr 1 2008

Keywords

  • Superconducting transition
  • Voltage noises
  • Vortex motion

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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