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Temperature-, magnetic-field-, and power-dependent microwave resistance of YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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We have measured the microwave resistance of sintered YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ at 9 GHz as a function of temperature, magnetic field, and microwave power. We observe a rapid change in slope with temperature about 1 K below the onset of the superconducting transition. There is a strong magnetic field dependence only below this slope-change temperature. This behavior is similar to that seen in low-frequency resistance measurements. We also observe an increase in microwave resistance with microwave power for temperatures below the superconducting onset temperature. We estimate that the microwave currents may be large enough to give such an effect due to weak-link structures in this material. We show that the power dependence is not due to bulk sample heating, but we cannot rule out self-heating on a microscopic scale.
Research Organization:
Department of Physics, Stanford University, Stanford, California 94305
OSTI ID:
6441240
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:10; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
GRANULAR MATERIALS
IMPEDANCE
MAGNETIC FIELDS
MATERIALS
MICROWAVE RADIATION
OXIDES
OXYGEN COMPOUNDS
PHOTOCONDUCTIVITY
PHYSICAL PROPERTIES
RADIATIONS
SINTERED MATERIALS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TRANSMISSION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES