Abstract
Measurements of the critical magnetic fields and the electrical resistance for σ phase alloys of the Mo 1− x Re itx (0.55 ⩽ x ⩽ 0.7) system are reported. The variation of T c lies within 0.5 K for various compositions and heat treatments. The extrapolated upper critical magnetic fields H c2 (0) are between 22.6 and 36.0 kG. A splat-quenched alloy of composition Mo-62at.%Re has an H c2 (0) value of 27.1 kG. Thus atomic disorder does not influence H c2 (0) significantly. The H c2 (0) values agree in general with the calculated H c2 ∗∗(0) values where paramagnetic effects have been included. The resistance ratio varies as T 3 in the low temperature region, then has a negative curvature (50 – 150K) and the curve is less than linear in T at temperatures above 150 K. This behaviour is similar to that of many other d and f band superconductors and can be explained by a modified s-d model.
Published Version
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