Enhancement of the critical current density in Chevrel phase superconducting wires
- DPMC, Universite de Geneve, 1211 Geneve 4 (Switzerland)
- High Field Magnet Laboratory and Research Institute for Materials, University of Nijmegen, Toernooiveld, NL-6525 ED Nijmegen (The Netherlands)
- Laboratoire de Chimie du Solide et Inorganique Moleculaire, Universite de Rennes (France)
The critical current densities J{sub c} of Chevrel phase wires with niobium as an antidiffusion barrier were measured in magnetic fields up to 24 T. At 20 T and 1.9 K, J{sub c} reaches 5.4{times}10{sup 8} A/m{sup 2} and decreases slightly down to 3.1{times}10{sup 8} A/m{sup 2} at 24 T. A wire with a 20{percent} superconducting cross section has been successfully drawn and its overall critical current density J{sub c}{sup ov} exceeds 100 A/mm{sup 2} at 1.9 K up to a magnetic field slightly above 20 T. This demonstrates the ability of Chevrel phase wires to be used in high magnetic field applications. Moreover, some parts of the coil have certainly higher J{sub c}, since J{sub c} is very often limited by a thermal excursion of the entire coil. The effective upper critical field {mu}{sub 0}H{sub c2}{sup {asterisk}}, deduced from the magnetic field dependence of J{sub c}, is too low compared to the expected bulk value, indicating that superconducting properties at the grain boundaries are still degraded. If the bulk {mu}{sub 0}H{sub c2} can be restored at the grain surfaces, J{sub c}{sup ov} should be higher than 100 A/mm{sup 2} up to at least 30 T. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496657
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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