Huge compact flux avalanches in superconducting Nb thin films
โ Scribed by M.S. Welling; R.J. Westerwaal; W. Lohstroh; R.J. Wijngaarden
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 435 KB
- Volume
- 411
- Category
- Article
- ISSN
- 0921-4534
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The disappeara.nce of superconductivity in ultra thin amorphous Nb films has been studied by the measurements of the electrical sheet resistance \_Rn and I-V characteristics. The mean field transition temperature Tยข0amd the Kosterlitz-Thouless transition temperature TKThaVe been determined for films
We measure current-voltage characteristics at high driving currents for different magnetic fields and temperatures in Nb thin films of rather strong pinning. In a definite range of the B-T phase diagram we find that a current induced transition occurs in the flux flow motion of the vortex lattice, n