Thermal and Electrical Conductivities of Mo-Re Alloys in the Superconducting and Normal States

This paper gives details of research carried out on the low-temperature properties of Mo-Re alloys in the superconducting and normal states. Measurements were made on a variety of Mo-Re alloys in various states of anneal, the alloys being in the form of fine wires, as suitable for the winding of high-field superconducting solenoids. Micrograph studies were made to determine the percentage of the various phases present in each specimen. The low-temperature measurements covered observations on the various speciments of the electrical resistivity and the thermal conductivity as functions of temperature and magnetic field. The measurements yielded evaluations of two of the three critical magnetic fields, ${\mathrm{H}}_{c2\mathrm{}}$ and ${\mathrm{H}}_{c3\mathrm{}}$, as functions of temperature and alloy constitution, the transition temperatures $T_c$, and the Landau-Ginzburg parameter $\kappa$. Detailed comparisons of the results are made with theoretical predictions and with results by previous authors on similar high-field superconducting alloys.