Relationship of low-field microwave absorption to the surface area and sample shape of YBa sub 2 Cu sub 3 O sub 7 minus. delta. superconductors
Journal Article
·
· Journal of Physical Chemistry; (USA)
- Univ. of Houston, TX (USA)
The relationship of surface area with the nonresonant low-field microwave absorption (LFMA) was investigated for the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} powder and solid slab samples that exhibit a critical current of {approximately} 1,200 A/cm{sup 2}. The intensity of the LFMA is found to be dependent on surface area, shape, and particle size. The LFMA intensity is observed to increase linearly with total surface area for the powder samples. It is also proportional to the surface area of slab samples with different shapes but only when the demagnetization factor is taken into account. The temperature dependence of the LFMA intensity is interpreted in terms of the coupling/decoupling of Josephson junctions and the microwave penetration that influence the total surface current. The total generated surface currents are interpreted as the sum of inter- and intragranular currents. It is suggested that the relative contributions of inter- and intragranular currents vary with temperature and sample morphology.
- OSTI ID:
- 6386986
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:15; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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· Journal of Physical Chemistry; (United States)
·
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION
ALKALINE EARTH METALS
BARIUM
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
DATA ANALYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY ABSORPTION
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
MICROWAVE RADIATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SUPERCONDUCTORS
SURFACE AREA
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION
ALKALINE EARTH METALS
BARIUM
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
DATA ANALYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY ABSORPTION
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
MICROWAVE RADIATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SUPERCONDUCTORS
SURFACE AREA
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM