ab -plane optical properties of YBa sub 2 Cu sub 3 O sub 7 minus. delta. Br sub y single crystals

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.2523· OSTI ID:5001743

Wang, Y ^[1]; Rao, A M ^[2]; Zhang, J; Bi, X; Eklund, P C ^[1]; Dresselhaus, M S ^[3]; Nguyen, P P; Moodera, J S; Dresselhaus, G ^[4]; Radousky, H B; Glass, R S; Fluss, M J ^[5]; Liu, J Z ^[6]

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1. Department of Physics, University of Kentucky, Lexington, Kentucky 40506 (United States)
2. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
3. Department of Physics and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
4. Francis Bitter National Magnet Laboratory, Massachusetts Institute of Techology, Cambridge, Massachusetts 02139 (United States)
5. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
6. Department of Physics, University of California Davis, Davis, California 95616 (United States)

Room-temperature infrared- and optical-spectroscopic measurements are reported on brominated YBa{sub 2}Cu{sub 3}O{sub 6.2} single-crystal samples. Incorporation of bromine in the lattice was observed in both Auger electron and infrared-spectroscopy experiments but the exact lattice site for bromine dopant atoms remains unknown. Five of the six in-plane infrared-active {ital E}{sub {ital u}} phonon modes were observed in YBa{sub 2}Cu{sub 3}O{sub 6.2}Br{sub {ital y}} samples and phonon frequency softening was observed for the 591-cm{sup {minus}1} phonon (Cu(2)-O(2) in-plane stretch) mode. The frequency-dependent optical conductivity {sigma}({omega}) was obtained from the Kramers-Kronig transformation of the near-normal-incidence reflectance {ital R}({omega}) measurements, and the resulting {sigma}({omega}) showed the presence of a mid-infrared band (centered at {similar to}2500 cm{sup {minus}1}) in YBa{sub 2}Cu{sub 3}O{sub 6.2}Br{sub {ital y}}.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5001743
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:5; 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
AUGER ELECTRON SPECTROSCOPY
BARIUM COMPOUNDS
BARIUM OXIDES
BROMINATION
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
CRYSTALS
ELECTRON SPECTROSCOPY
FREQUENCY DEPENDENCE
HALOGENATION
HIGH-TC SUPERCONDUCTORS
INFRARED SPECTRA
KRAMERS-KRONIG CORRELATION
MONOCRYSTALS
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SPECTRA
SPECTROSCOPY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES