Temperature and frequency dependence of complex conductance of ultrathin YBa2Cu3O7-x films: Observation of vortex-antivortex pair unbinding

V. A. Gasparov, G. E. Tsydynzhapov, I. E. Batov, Qi Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We have studied the temperature dependencies of the complex sheet conductance, σ(ω,T), of 1-3 unit cell (UC) thick YBa 2Cu3O7-x films sandwiched between semiconducting Pr0.6Y0.4Ba2Cu3 O7-x layers at high frequencies. We have found: (i) quadratic temperature dependence of the kinetic inductance, Lk -1(T), with a break in slope at Tdc BKT, (ii) the maximum of real part of conductance and large shift of the onset temperature and the peak of ωσ- 1(T) to higher temperatures with increasing ω. We obtain the universal ratio Tdc BKT/L k -1(Tdc BKT)=25, 25, and 17 nH K for 1, 2 and 3-UC films, respectively in relation with theoretical prediction of 12 nH K for vortex-antivortex unbinding transition.

Original languageEnglish (US)
Title of host publicationLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
Pages481-482
Number of pages2
Volume850
DOIs
StatePublished - 2006
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: Aug 10 2006Oct 17 2006

Other

OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
CountryUnited States
CityOrlando, FL
Period8/10/0610/17/06

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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