Optical response of an ultrathin film and a large-angle grain-boundary in superconducting YBa2Cu3O7-δ

S. Bhattacharya, X. X. Xi, M. Rajeswari, C. Kwon, S. N. Mao, Qi Li, T. Venkatesan

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Abstract

We have investigated the optical response of epitaxial ultrathin (3 nm) YBa2Cu3O7-δ film on NdGaO3 substrate and thin (50 nm) film of YBa2Cu3O 7-δ on a bicrystal SrTiO3 substrate. While the current-voltage characteristics of the ultrathin film indicate a Kosterlitz-Thouless transition (associated with vortex-antivortex unbinding) at a temperature TKT, we do not observe any optical response at or below TKT. An enhanced optical response with nonbolometric characteristics was observed from the grain-boundary as compared to the bolometric optical response of the epitaxial film at the resistive transition. These results indicate that the grain-boundary weak links play a significant role in the enhanced optical response near Tc.

Original languageEnglish (US)
Pages (from-to)3510-3512
Number of pages3
JournalApplied Physics Letters
Volume62
Issue number26
DOIs
StatePublished - 1993

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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