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

doi:10.1063/1.109011

Optical response of an ultrathin film and a large-angle grain-boundary in superconducting YBa₂Cu₃O_7-δ

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

Physics

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

We have investigated the optical response of epitaxial ultrathin (3 nm) YBa₂Cu₃O_7-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 T_KT, we do not observe any optical response at or below T_KT. 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 T_c.

Original language	English (US)
Pages (from-to)	3510-3512
Number of pages	3
Journal	Applied Physics Letters
Volume	62
Issue number	26
DOIs	https://doi.org/10.1063/1.109011
State	Published - 1993

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.109011

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

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.",

author = "S. Bhattacharya and Xi, \{X. X.\} and M. Rajeswari and C. Kwon and Mao, \{S. N.\} and Qi Li and T. Venkatesan",

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doi = "10.1063/1.109011",

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T1 - Optical response of an ultrathin film and a large-angle grain-boundary in superconducting YBa2Cu3O7-δ

AU - Bhattacharya, S.

AU - Xi, X. X.

AU - Rajeswari, M.

AU - Kwon, C.

AU - Mao, S. N.

AU - Li, Qi

AU - Venkatesan, T.

PY - 1993

Y1 - 1993

N2 - 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.

AB - 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.

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SP - 3510

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 26

ER -

Optical response of an ultrathin film and a large-angle grain-boundary in superconducting YBa₂Cu₃O_7-δ

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