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Far-infrared measurements have been made to determine the superconducting energy gap widths in bulk samples of binary alloys in the system Zr-Nb-Mo. The variation of the gap width 2Δ with concentration is qualitatively similar to the variation of the critical temperature Tc. There is a marked variation in the BCS coupling constant V. The relation between 2ΔkTc and V is opposite to that in the simple metals.
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Cappelletti et al. (1967) studied this question.
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