A comparison of the modulated microwave absorption spectra of ceramic and powdered YBa sub 2 Cu sub 3 O sub 7 minus. delta. samples

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Journal of Materials Research; (USA)

DOI:https://doi.org/10.1557/JMR.1990.1813· OSTI ID:6436703

Rubins, R S ^[1]; Hutton, S L ^[2]; Drumheller, J E ^[3]; Jeong, D Y ^[4]; Black, T D ^[5]

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1. Department of Physics, Montana State University, Bozeman, MT (USA) Department of Physics, University of Texas at Arlington, Arlington, TX (USA)
2. Department of Physics, Montana State University, Bozeman, MT (USA) Department of Physics, Johannes Gutenberg University of Mainz, Mainz (West Germany)
3. Department of Physics, Montana State University, Bozeman, MT (USA)
4. Department of Physics, University of Texas at Arlington, Arlington, TX (USA) Korea Electrotechnology Research Institute, Changwon (South Korea)
5. Department of Physics, University of Texas at Arlington, Arlington, TX (USA)

Flux trapping in the 9.3 GHz modulated microwave absorption spectra observed near 4 K from ceramic and powdered ceramic specimens of two separately prepared YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} samples has been used to separate the intergranular and intragranular contributions to the spectra. In the denser, glassy sample, a broad absorption with a peak near 400 Oe for forward sweeps was observed with appreciable intensity after the maximum flux was trapped. This spectrum is attributed to intergranular junctions, since its relative intensity was reduced on powdering and suspending in wax. In the less dense, more uniform sample, the latter spectrum was appreciably weaker in both ceramic and powder. Both types of junction appear to contribute to the narrow low-field absorption which was observed after zero field cooling in all the samples.

• OSTI ID: 6436703
• Journal Information: Journal of Materials Research; (USA), Journal Name: Journal of Materials Research; (USA) Vol. 5:9; ISSN JMREE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
INFORMATION
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FLUX
MICROWAVE RADIATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
RADIATIONS
SPECTRA
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRAPPING
ULTRALOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES