Coexistence of s-Wave Superconductivity and Antiferromagnetism

M. Feldbacher (1) , F.F. Assaad (1, 2) , Frederic Hebert (3) , G. George Batrouni (4)

1 Institut für Theoretische Physik III
2 Max Planck Institute for Solid State Research
3 Theoretische Physik
4 INLN - Institut Non Linéaire de Nice Sophia-Antipolis

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.

Mots clés: Hubbard model; antiferromagnetism; magnetic transitions; Monte Carlo methods; superconducting transitions

Domaines: Adaptation et Systèmes auto-organisés [nlin.AO]

M. Feldbacher, F.F. Assaad, Frederic Hebert, G. George Batrouni. Coexistence of s-Wave Superconductivity and Antiferromagnetism. Physical Review Letters, 2003, 91, pp.056401. ⟨10.1103/PhysRevLett.91.056401⟩. ⟨hal-00023812⟩