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Author Gao, F. ♦ Carr, G. L. ♦ Porter, C. D. ♦ Tanner, D. B. ♦ Williams, G. P. ♦ Hirschmugl, C. J. ♦ Dutta, B. ♦ Wu, X. D. ♦ Etemad, S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ HIGH-TC SUPERCONDUCTORS ♦ QUASI PARTICLES ♦ SUPERCONDUCTING FILMS ♦ YTTRIUM OXIDES ♦ BARIUM OXIDES ♦ COPPER OXIDES ♦ TEMPERATURE DEPENDENCE ♦ ELECTRIC CONDUCTIVITY ♦ INFRARED RADIATION ♦ FREQUENCY DEPENDENCE ♦ SPIN-LATTICE RELAXATION ♦ SKIN EFFECT
Abstract The far-infrared (30{endash}350 cm{sup {minus}1}) transmittance and reflectance of two {ital ab}-plane-oriented YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films have been measured. These data show that the quasiparticle relaxation rate, 1/{tau}, has a fast decrease below {ital T}{sub {ital c}} and saturates at {ital T}{lt}{ital T}{sub {ital c}}. Above {ital T}{sub {ital c}}, 1/{tau} exhibits a linear temperature dependence, in accord with the linear dc resistivity in the normal state. The fast decrease of 1/{tau} is unique and intrinsic to the high-{ital T}{sub {ital c}} cuprates; it does not occur in conventional BCS superconductors, where the scattering is from impurity or phonons. The low-frequency conductivity {sigma}{sub 1} inferred from the far-infrared transmittance and reflectance measurements exhibits a peak just below {ital T}{sub {ital c}}. The conductivity peak occurs at higher frequencies than those expected for BCS coherence effects. The peak in {sigma}{sub 1} is attributed to the rapid drop in 1/{tau} combined with a decreasing normal-fluid density. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-07-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 1


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