Far-infrared transmittance and reflectance studies of oriented YBa sub 2 Cu sub 3 O sub 7 minus. delta. thin films

Journal Article · Wed May 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.10383· OSTI ID:5561783

Gao, F; Carr, G L; Porter, C D; Tanner, D B ^[1]; Etemad, S; Venkatesan, T; Inam, A ^[2]; Dutta, B; Wu, X D ^[3]; Williams, G P; Hirschmugl, C J ^[4]

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1. Department of Physics, University of Florida, Gainesville, Florida 32611 (USA)
2. Bell Communications Research, Red Bank, New Jersey 07701 (USA)
3. Department of Physics, Rutgers University, Piscataway, New Jersey 08855 (USA)
4. Brookhaven National Laboratory, Upton, New York 11973 (USA)

We have measured both the transmittance ({ital scrT}) and reflectance ({ital scrR}) for several YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin films over the frequency range from 20 to 360 cm{sup {minus}1} at temperatures between 20 and 300 K. The films, grown on MgO substrates by pulsed laser ablation, are highly {ital a}-{ital b}-plane oriented. We use {ital scrT} and {ital scrR} to extract the optical conductivity, and find good agreement with results from Kramers-Kronig analysis of reflectance measurements alone. The transmittance is consistent with a two-component dielectric function consisting of Drude (free-carrier) and midinfrared (bound-carrier) absorption. The Drude relaxation rate varies linearly with temperature, and compares well with values obtained from the measured dc resistivity. We use a two-fluid model for the superconducting state and obtain a BCS-like temperature dependence for the superfluid density. A superconducting gap is not observed in our spectra.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5561783
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:13; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
FAR INFRARED RADIATION
FILMS
INFRARED RADIATION
LIGHT SCATTERING
LOW TEMPERATURE
MEDIUM TEMPERATURE
OPTICAL PROPERTIES
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
REFLECTIVITY
SCATTERING
SUPERCONDUCTING FILMS
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES