title: Coexistence of s-wave superconductivity and antiferromagnetism.
abstract: We study the phase diagram of a new model that exhibits a first order transition between s-wave superconducting and antiferromagnetic phases. The model, a generalized Hubbard model augmented with competing spin-spin and pair-pair interactions, was investigated using the projector quantum Monte Carlo method. Upon varying the Hubbard U from attractive to repulsive, we find a first order phase transition between superconducting and antiferromagnetic states.
authors.affiliation: Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Feldbacher
authors.forename: F F
authors.initials: FF
authors.lastname: Assaad
authors.forename: F
authors.initials: F
authors.lastname: Hébert
authors.forename: And G G
authors.initials: AG
authors.lastname: Batrouni