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

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)

Access to Document

10.1063/1.109011

Cite this

@article{b13617be20304004b571a51c02c8cb81,

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",

year = "1993",

doi = "10.1063/1.109011",

language = "English (US)",

volume = "62",

pages = "3510--3512",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "26",

}

TY - JOUR

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.

UR - http://www.scopus.com/inward/record.url?scp=3643136641&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3643136641&partnerID=8YFLogxK

U2 - 10.1063/1.109011

DO - 10.1063/1.109011

M3 - Article

AN - SCOPUS:3643136641

SN - 0003-6951

VL - 62

SP - 3510

EP - 3512

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

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this