Effects of interlayer coupling on the magnetic and transport properties of superconducting multilayers and high-temperature superconductors
The effect of interlayer coupling on the transport properties and dissipation in a magnetic field is reviewed for superconducting multilayers including highly-anisotropic high-temperature superconductors (HTS). For the applied field parallel to the superconducting layers the absence of any Lorentz-force dependence of the dissipation leads to an explanation other than flux motion. This is consistent with a Josephson junction dissipation which dominates flux motion of the insulating regions between layers. However, in is seen to cross over from phase slips at Josephson junctions to depinning of vortices from the external field at high fields and temperatures. For fields perpendicular to the superconducting layers the much greater resistive broadening in HTS is due to dissipation by thermally-activated flux motion, consistent with a lack of intrinsic pinning. We show 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 after k{sub B}T exceeds the Josephson coupling energy.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10160958
- Report Number(s):
- ANL/MSD/CP-83133; CONF-940121-4; ON: DE94014000; CNN: DMR 91-20000
- Resource Relation:
- Conference: Superconducting superlattices and multilayers and oxide superconductory physics and nanoengineering,Los Angeles, CA (United States),23-28 Jan 1994; Other Information: PBD: 1994
- Country of Publication:
- United States
- Language:
- English
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