Three-Body Collective Excitations in the Superconducting Phase of MgB2
Abstract
It is shown that coherent behavior of Cooper's pairs and electrons in the two-band superconductors MgB2 is possible as a result of a strong two-phonon-electron coupling. The spin- 12 triples with zero angular momentum are made up of three spin- 12 fermions with charge e. They are gapped Fermi excitations with gap induced by the gaps of the single fermions. Their contribution to the thermodynamics of the MgB2 superconductors is considered.
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