Low-field microwave absorptions of silver-doped YBa sub 2 Cu sub 3 O sub 7-. delta. superconductors

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

DOI:https://doi.org/10.1021/j100156a024· OSTI ID:5294385

Puri, M; Masiakowski, J; Marrelli, S; O'Conner, S; Bear, J; Kevan, L ^[1]

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1. Univ. of Houston, TX (USA)

Superconducting and microstructural properties of silver-doped YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} composites have been studied as a function of silver content. An increase by {approximately}8 K in the superconducting transition temperature is observed by resistance measurement above 4.2 wt % silver. Silver seems to act as a flux to propagate the formation of oblong-shaped grains. The grain size increases with silver doping, and at high concentrations of silver it also induces grain alignment. Silver is not observed to substitute for Cu in YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}. Low-field microwave absorption (LFMA) shows different hysteresis and power dependence behavior between YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} and silver-doped samples. The LFMA signal intensity decreases with increasing silver content, and the maximum response shifts to higher temperature. The LFMA signal is explained by magnetic flux trapping at pinning sites, inter- and intragranular currents through Josepheson junctions, and variation in microwave penetration depth with temperature and silver content.

• OSTI ID: 5294385
• 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
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
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
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
GRAIN SIZE
HIGH-TC SUPERCONDUCTORS
INFORMATION
LATTICE PARAMETERS
MATERIALS
MICROSCOPY
MICROSTRUCTURE
MICROWAVE RADIATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SIZE
SPECTROSCOPY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES