Flux motion effects in Tl-Ca-Ba-Cu-O thin films
Flux motion effects, flow and creep, have been identified as one of the major problem areas in high temperature superconductors. In this paper, we examine these effects in polycrystalline thin films of the Tl--Ca--Ba--Cu--O high temperature superconductors. Films with transport critical current densities to 9{times}10{sup 5} A/cm{sup 2} at 77 K and no weak-link behavior have been obtained. the activation energy for flux motion as a function of temperature has been determined by static magnetization and magnetotransport measurements. Estimated activation energies at 77 K from these techniques are 200 meV at 50 mT and 41 meV at 1 T, respectively. We discuss a new superconducting device, the superconducting flux flow transistor, fabricated from photolithographically patterned films, that utilizes switching between the superconducting and flux flow states as the active device mode. These devices show the potential for operation to 60 GHz utilizing the current films. 36 refs., 6 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7122341
- Report Number(s):
- SAND-90-1228C; CONF-900424--3; ON: DE90012176
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CURRENT DENSITY
DEPOSITION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
MAGNETORESISTANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS