Pinning forces and lower critical fields in YBa sub 2 Cu sub 3 O sub y crystals: Temperature dependence and anisotropy
Journal Article
·
· Physical Review Letters; (USA)
- Department of Physics, Northeastern University, Boston, MA (USA)
Measurements of the field-dependent radiofrequency penetration depth {lambda}({ital H},{ital T}) are used to delineate the lower-critical-field {ital H}{sub {ital c}1}-{ital T} phase boundary, and to study flux dynamics in YBa{sub 2}Cu{sub 3}O{sub {ital y}} crystals. For both {bold H}{parallel}{bold {cflx c}} and {bold H}{perpendicular}{bold {cflx c}} {ital H}{sub {ital c}1} obeys a BCS temperature dependence with a temperature-independent anisotropy of 3.4{plus minus}0.3. In the mixed state, the data obey {lambda}{sup 2}({ital H})=({phi}{sub 0}/{mu}{sub 0}{alpha}({ital T})){ital B}({ital H}), and yield both the functional dependence {ital B}({ital H}) and the pinning force constant {alpha}({ital T}). The latter is anisotropic, obeys an approximately (1{minus}{ital t}{sup 2}){sup 2} temperature dependence, and vanishes slightly below the bulk transition temperature.
- OSTI ID:
- 6084909
- Journal Information:
- Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 65:16; ISSN PRLTA; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
DATA
DYNAMICS
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
INFORMATION
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC FLUX
MECHANICS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
RF SYSTEMS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
DATA
DYNAMICS
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
INFORMATION
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC FLUX
MECHANICS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
RF SYSTEMS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES