Observation of the crossover between bulk flux pinning and Josephson phase slips in the critical current of granular superconducting NbN/AlN multilayer films
| Autor: | Harald W. Weber, Dean J. Miller, R. T. Kampwirth, Kenneth E. Gray, Damian P. Hampshire, R. Herzog, J.M. Murduck |
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| Rok vydání: | 1991 |
| Předmět: |
Superconductivity
Josephson effect Materials science Flux pinning Condensed matter physics Energy Engineering and Power Technology Flux Condensed Matter Physics Electronic Optical and Magnetic Materials Magnetic field Condensed Matter::Superconductivity Phase (matter) Electrical and Electronic Engineering Pinning force Critical field |
| Zdroj: | Physica C: Superconductivity. 174:340-344 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(91)91566-m |
| Popis: | The critical current density, J c in granular NbN/AlN multilayer films shows a sharp crossover with reduced magnetic field, b ≡ H / H c 2 where H c2 is the upper critical field, from the (1− b ) 2 dependence associated with bulk flux pinning at large b to a much weaker dependence at smaller b . We interpret this as coexistence of bulk flux depinning with phase slips in intergranular Josephson junctions, such that the one with the smaller J c is observed. The dependence on b , pinning strength, Lorentz-force and neutron irradiation are all consistent with such a crossover. |
| Databáze: | OpenAIRE |
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