Abstract
We show that the on-site spins of localized and itinerant electrons in the double-exchangemodel are misaligned when the on-site Coulomb repulsion is large enough. To explore thisphenomenon we use the Schwinger-boson representation of the localized spins andintroduce two spin-singlet fermion operators. In terms of the new Fermi fields, the on-siteHund’s interaction is in a diagonal form and the true magnons of the system are identified.The singlet fermions can be understood as electrons dressed by a cloud of repeatedlyemitted and reabsorbed magnons. The quantum phase transition between ferromagnetismand the new phase is studied by varying the Coulomb repulsion for different values ofparameters in the theory such as the Hund’s coupling and chemical potential.
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