Raman microprobe investigation of laser-assisted chemically-induced oxygen variation in the high T sub c superconductors YBa sub 2 Cu sub 3 O sub x

Conference · Thu Jan 25 00:00:00 EST 1990 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6552428

Roughani, B; Sengupta, L C; Aubel, J; Sundaram, S ^[1]

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1. Department of Physics, University of South Florida, Tampa, FL (USA)

Effects of focused Ar{sup +} laser irradiation on YBa{sub 2}Cu{sub 3}O{sub {ital x}} in air, N{sub 2}, and O{sub 2} ambients were studied with a Raman microprobe. Drastic changes in the Cu-O stretching mode (A{sub g}) in our Raman spectra recorded in air ambient indicate an orthorhombic to tetragonal phase transformation in the YBa{sub 2}Cu{sub 3}O{sub {ital x}} sample. Laser irradiation of the sample in oxygen ambient shows a reversed behavior compared to that in air. When irradiated in nitrogen ambient, it shows additional Raman lines compared wot the spectra for the starting material. This may be due to formation of BaCuO{sub 2} and O(4) vacancies. The reversibility of oxygen exchange in nitrogen and oxygen ambient was also studied. The observed effects in the Raman spectra were interpreted as the chemically induced oxygen desorption and absorption assisted by Ar{sup +} laser irradiation.

• OSTI ID: 6552428
• Report Number(s): CONF-891092-; CODEN: APCPC; TRN: 90-033292
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (USA), Vol. 199:1; Conference: 3. annual topical conference on high Tc superconducting thin films: processing, characterization, and applications, Boston, MA (USA), 23-27 Oct 1989; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
LASER-RADIATION HEATING
COPPER OXIDES
YTTRIUM OXIDES
CRITICAL TEMPERATURE
CRYSTAL-PHASE TRANSFORMATIONS
HIGH-TC SUPERCONDUCTORS
PEROVSKITES
RAMAN SPECTROSCOPY
STOICHIOMETRY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
HEATING
LASER SPECTROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLASMA HEATING
SPECTROSCOPY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360206 - Ceramics
Cermets
& Refractories- Radiation Effects