Analysis of the low-field microwave absorption line shape differences in YBa sub 2 Cu sub 3 O sub x and Bi sub 2 Sr sub 2 CaCu sub 2 O sub x superconductors

Journal Article · Thu Feb 07 04:00:00 EST 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100156a066· OSTI ID:5205797

Masiakowski, J T; Puri, M; Kevan, L ^[1]

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1. Univ. of Houston, TX (USA)

The field-dependent low-field microwave absorption for YBa{sub 2}Cu{sub 3}O{sub x} (123) and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} (2212) superconducting powders and a 2212 crystal was investigated as a function of temperature and magnetic field modulation amplitude. The 2212 samples do not show a significant magnetic field sweep hysteresis while the 123 samples show a hysteresis strongly dependent on temperature and modulation amplitude. The microwave absorption line shapes for all samples, including the signals exhibiting strong hysteretic behavior, can be well simulated by a model for the microwave loss in intergranular Josephson junctions involving boundary and microwave-induced currents. The calculation allow an estimate of the average Josephson junction length to be about half the average grain size observed by scanning electron microscopy. Interpretation based on the assumptions in the line shape model indicates that the Josephson junctions are more weakly coupled in 2212 than in 123 superconductors.

• OSTI ID: 5205797
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:3; ISSN 0022-3654; ISSN JPCHA
• 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 SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCULATION METHODS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
INFORMATION
MAGNETIC FIELDS
MICROWAVE SPECTRA
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SPECTRA
SPECTROSCOPY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES