Two-dimensional collective flux pinning, defects, and structural relaxation in amorphous superconducting films
The existence of two-dimensional collective pinning has been experimentally confirmed by measuring the pinning force F/sub p/ in superconducting amorphous films of transition-metal--metalloid alloys (Nb/sub 3/Ge, Nb/sub 3/Si, Mo/sub 3/Si) as a function of perpendicular field, temperature, and thickness of the specimens. The field and temperature dependence of F/sub p/ can be well explained if it is assumed that the pinning defects in these amorphous superconductors are quasidislocation loops of sizes comparable to the superconducting coherence length. Structural relaxation studies in Nb/sub 3/Ge show that these defects are stable against annealing at temperatures up to at least 0.8 of the recrystallization temperature. The possible effect of randomly distributed pinning centers (random field) on the phase transitions of a two-dimensional flux-line lattice is briefly discussed.
- Research Organization:
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
- OSTI ID:
- 5475650
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 28:9; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
AMORPHOUS STATE
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DIMENSIONS
DISLOCATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
FILMS
GERMANIUM ALLOYS
INFORMATION
LINE DEFECTS
MAGNETIC FIELDS
MAGNETIC FLUX
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
NIOBIUM ALLOYS
NIOBIUM COMPOUNDS
NIOBIUM SILICIDES
NUMERICAL DATA
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SCATTERING
SILICIDES
SILICON COMPOUNDS
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THICKNESS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
X-RAY DIFFRACTION