Dependence of critical current density on microstructure in the SnMo{sub 6}S{sub 8} Chevrel phase superconductor
- Applied Superconductivity Center, University of Wisconsin---Madison, 1500 Johnson Drive, Madison, Wisconsin 53706 (United States)
Microstructure and superconducting properties of hot isostatic pressed SnMo{sub 6}S{sub 8} were systematically studied. Magnetization was measured in fields up to 30 T at 4.2--14 K. SnMo{sub 6}S{sub 8} exhibits critical current densities limited by flux pinning, not by granularity. Samples exhibited {ital B}{sub irr}({ital T}){similar_to}{ital B}{sub {ital c}{sub 2}}({ital T}), indicative of strong flux pinning. Pinning force curves contained two distinct peaks, indicating that at least two pinning mechanisms are active. The microstructure contained two types of defects which could pin flux: grain boundaries and planar intragranular defects. Lower-field pinning ({ital B}/{ital B}{sub {ital c}{sub 2}}{le}0.3) was directly correlated to the grain boundary density. Higher-field pinning ({ital B}/{ital B}{sub {ital c}{sub 2}}{ge}0.5) appeared to be controlled by the intragranular pins. Compared to Nb{sub 3}Sn, the grain sizes are large and the contribution from grain boundary pinning is small. Inhibiting grain growth through lower-temperature processing and increasing the density of intragranular defects both appear feasible means of further increasing {ital J}{sub {ital c}}. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- OSTI ID:
- 64871
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 77; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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