Infrared synchrotron-radiation transmission measurements on YBa sub 2 Cu sub 3 O sub 7 minus. delta. in the gap and supercurrent regions

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.4752· OSTI ID:6925989

Williams, G P; Budhani, R C; Hirschmugl, C J ^[1]; Carr, G L ^[2]; Perkowitz, S; Lou, B; Yang, T R ^[3]

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1. Brookhaven National Laboratory, Upton, New York 11973 (USA)
2. Department of Physics, University of Florida, Gainesville, Florida 32611 (USA)
3. Department of Physics, Emory University, Atlanta, Georgia 30322 (USA)

We report infrared synchrotron-radiation transmission measurements on {similar to}1-{mu}m-thick films of high-{ital T}{sub {ital c}} YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} from 40 to 290 cm{sup {minus}1} (5 to 36 meV). The films were deposited onto MgO substrates and showed resistive superconducting transitions with an onset at 83 K. Spectra below {ital T}{sub {ital c}} show superconducting behavior, including the characteristic 1/{omega} supercurrent dependence for frequencies below 100 cm{sup {minus}1}. The entire spectrum can be fit when a Mattis-Bardeen-type conductivity is included identifying increasing absorption beginning at a photon energy of 23 meV. However, a substantial residual absorption persists to the lowest measured frequencies. In addition, the appearance of phonons, some attributable to {ital c}-axis vibrations, suggests we are sampling a mixture of both {ital a}-{ital b}--plane and {ital c}-axis properties.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6925989
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:7; ISSN 0163-1829; ISSN PRBMD
• 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
BREMSSTRAHLUNG
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
ENERGY GAP
FILMS
INFRARED RADIATION
LIGHT TRANSMISSION
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SUPERCONDUCTING FILMS
SYNCHROTRON RADIATION
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES