Temperature dependence of the linewidths of the Raman-active phonons of YBa sub 2 Cu sub 3 O sub 7 : Evidence for a superconducting gap between 440 and 500 cm sup minus 1
Journal Article
·
· Physical Review, B: Condensed Matter; (USA)
- Sandia National Laboratories, Livermore, California 94551 (USA)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (USA)
- Department of Physics, University of California, Davis, Davis, California 95616 (USA)
The linewidths and frequencies of three Raman-active phonons have been measured in twin-free single crystals of YBa{sub 2}Cu{sub 3}O{sub 7}. Below {ital T}{sub {ital c}}, the phonon at 340 cm{sup {minus}1} sharpens dramatically, the phonon at 440 cm{sup {minus}1} sharpens slightly, and the phonon at 500 cm{sup {minus}1} broadens. The temperature dependence of the phonon linewidths places the superconducting energy gap (2{Delta}) between 440 and 500 cm{sup {minus}1}, or 2{Delta}=6.8{ital k}{sub {ital B}T{ital c}}--7.7{ital k}{sub {ital B}T{ital c}}. Based upon the observed change in linewidth, the electron-phonon coupling strength of the 340-cm{sup {minus}1} phonon is estimated to be between 0.6 and 0.8.
- DOE Contract Number:
- AC04-76DP00789; W-7405-ENG-48
- OSTI ID:
- 5561896
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:16; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Conference
·
Thu Mar 31 23:00:00 EST 1994
· Journal of Superconductivity; (United States)
·
OSTI ID:6655135
Temperature dependence of the phonon frequencies, linewidths, and Raman-continuum scattering of single-domain Y sub 0. 56 Pr sub 0. 44 Ba sub 2 Cu sub 3 O sub 7
Journal Article
·
Sat Oct 31 23:00:00 EST 1992
· Physical Review, B: Condensed Matter; (United States)
·
OSTI ID:6947210
Modeling oxygen isotope shifts and line-broadening effects of the 502-cm sup minus 1 Raman mode of YBa sub 2 Cu sub 3 O sub 7 minus x
Journal Article
·
Thu Jan 31 23:00:00 EST 1991
· Physical Review, B: Condensed Matter; (USA)
·
OSTI ID:5885839
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRON-PHONON COUPLING
ENERGY GAP
LINE WIDTHS
LOW TEMPERATURE
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHONONS
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRON-PHONON COUPLING
ENERGY GAP
LINE WIDTHS
LOW TEMPERATURE
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHONONS
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES