Coexistence of ferromagnetism and singlet superconductivity via kinetic exchange.
We propose a novel mechanism for the coexistence of metallic ferromagnetism and singlet superconductivity assuming that the magnetic instability is due to kinetic exchange. Within this scenario, the unpaired electrons which contribute to the magnetization have a positive feedback on the gain of the kinetic energy in the coexisting phase by undressing the effective mass of the carriers involved in the pairing. The evolution of the magnetization and pairing amplitude and the phase diagram are first analyzed for a generic kinetic exchange model and then are determined within a specific case with spin dependent bond-charge occupation.
Cuoco
Mario
M
Unità I.N.F.M. di Salerno, Dipartimento di Fisica "E. R. Caianiello," Università di Salerno, I-84081 Baronissi (Salerno), Italy.
Gentile
Paola
P
Noce
Canio
C