Flux pinning and dissipation in high-temperature superconductors
The effect of anisotropy on the field-induced broadening of resistive transitions in thehighly-anisotropic high-temperature superconductors (HTS) is considered. For the applied field, H, parallel to the superconducting Cu-O layers the absence of a Lorentz-force, together with intrinsic pinning of the insulating region between layers, leads to an explanation other than flux motion. However, for H parallel to the c-axis, the lack of intrinsic pinning implies that the much greter broadening is due to thermally-activated flux motion. We shown experimental evidence that the associated flux motion occurs as a result of a crossover from three dimensional (3D) vortex lines to 2D independent pancake-like vortices, residing in the Cu-O layers. This 3D to 2D crossover occurs when k{sub B}T exceeds the Josephson coupling energy. For YBa{sub 2}Cu{sub 3}O{sub 7}, this dimensional crossover does not occur below H{sub c2}, presumably because the conducting Cu-O chains short circuit the Josephson interlayer coupling. 36 refs., 7 figs., 1 tab.
- Research Organization:
- Argonne National Lab., IL (USA)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5553952
- Report Number(s):
- ANL/CP-73158; CONF-910410-1; ON: DE91014466
- Resource Relation:
- Conference: International workshop on high T/sub c/ superconductor thin films: properties and applications, Rome (Italy), 15-19 Apr 1991
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
ELECTRIC CONDUCTIVITY
ALUMINIUM NITRIDES
ANISOTROPY
BARIUM OXIDES
COPPER OXIDES
LAYERS
MAGNETIC FIELDS
NIOBIUM NITRIDES
PHYSICAL PROPERTIES
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
NIOBIUM COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
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