Flux-creep and viscous flux-line motion in thin films of A- Nb3Ge
β Scribed by P. Berghuis; P.H. Kes
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 372 KB
- Volume
- 165-166
- Category
- Article
- ISSN
- 0921-4526
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β¦ Synopsis
The resistance transition and IV curves of thin amorphous N~Ge films (T e ~3K) were measured in magnetic fields perpendicular to the film surface. The vortex lattice (VL) in this geometry consists of straight f1uxlines (two dimensional VL). In a narrow regime just below the transition line, B e2 (T), we find clear evidence for thermally assisted flux-flow followed by melting of the vortex lattice.
π SIMILAR VOLUMES
A model for vortex depinning and motion is presented, which takes into account the inhomogeneity of a real type-II superconducting sample. The model is based upon a mechanism in which the flux-line lattice is depinned by synchronous shear around vortices, which are too strongly pinned to be broken.
The superconducting transition and critical current density were studied for epitaxial YBa2Cu307\_x thin films as a function of temperature, magnetic field and electric voltage gradient. A linear section of the curve of the logarithm of apparent voltage versus transport current density, In(E)-J, was