Quasiparticle damping and the coherence peak in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Physics, University of Florida, Gainesville, Florida 32611 (United States)
- Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Bell Communications Research, Red Bank, New Jersey 07701 (United States)
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.}
- OSTI ID:
- 285640
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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