Abstract
We first relate empirically the superconducting transition temperature,Tc, of the bcc d-band metals to the velocity of sound and the reduced Cauchy discrepancyc* = (c12−c44)/(c12+c44). Then, to be definite, by restricting ourselves to the BCS formula forTc, we relate the BCS electron–phonon interaction to the Debye temperature and the soundvelocity. By contrast the six fcc metals with both filled (Cu, Ag, Au) and incomplete (Ni,Pd, Pt) d-shells, which are not superconducting at room temperature, do not display anysuch relationship and instead show trends in their elastic constants consistent with thebond-charge model.
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