Frequency and temperature dependence of complex conductance of ultrathin YBa2Cu3O7-x films: A study of vortex-antivortex pair unbinding

Vitaly A. Gasparov, I. E. Batov, Qi Li, C. Kwon

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Abstract

We have studied frequency and temperature dependences of complex sheet conductance of ultrathin (1-3 unit cell (UC) thick) YBa2Cu3O7-x films using a radio frequency (1-20, 100-1000 MHz) sheet impedance and a microwave (30 GHz) loss measurements. We found the activated temperature dependence of the vortex diffusion constant and scaling behaviour of the universal ratio TKTBDC/Lk-1(TKTB) for 1UC, 2UC and 3UC YBCO films, in close agreement with theoretical prediction for vortex-antivortex unbinding transition.

Original languageEnglish (US)
Pages (from-to)1021-1022
Number of pages2
JournalPhysica B: Condensed Matter
Volume284-288
Issue numberPART I
DOIs
Publication statusPublished - Jan 1 2000

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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