Abstract
The temperature dependence of the paramagnetic susceptibility was measured for several binary A15-type compounds of transition elements. Measurements were made between room temperature and either 3° K or the superconducting transition temperature, whichever was higher. The susceptibilities were found to have, in most cases, a small linear temperature dependence. Molar susceptibilities x M , superconducting transition temperaturesT c, and electronic specific heat coefficients γ for these compounds, when plotted as a function of the valence-electron concentratione/a, reveal peaks at ane/a of about 6.5 for all three properties. Compounds containing the 4d-series transition-elements molybdenum or niobium have higherT c and lower x M values than compounds containing the 3d transition-element chromium or vanadium. It appears that an increased mixing of atoms on either of the two crystallographic sites in the A15-type structure can be associated with a significant decrease in the paramagnetic susceptibility of the compound.
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