Superconducting critical properties and AC losses in a large sample of i n s i t u formed Cu-Nb3Sn composite
- 1 January 1980
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 36 (1), 85-87
- https://doi.org/10.1063/1.91284
Abstract
Critical‐current density, upper critical field, and hysteresis ac losses have been evaluated for a large (100‐m long) sample of in situ formed Cu‐Nb3Sn composite with superconducting volume fraction λ≃0.23. The magnetic field dependence of the critical current, measured in wire and tape samples of different reductions, cannot be explained by a model based on a single pinning mechanism. The enhancement of the pinning force in highly reduced tape composites is attributed to surface flux pinning at the filament‐matrix interfaces. Hysteretic ac losses obtained by calorimetric and electronic measuring methods confirmed the results reported previously for small in situ samples.Keywords
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