We consider the properties of a superconductor with a joint mechanism. One involves, otherwise unspecified, high-energy excitations and is modelled with a BCS pairing potential. The other is of low energy, presumably involving phonons. When the second contribution is significant, the resulting properties can differ greatly from BCS, and for most but not all properties, in a direction opposite to that expected for conventional strong coupling systems.
Volume 43, 2020
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