About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Paper
Antiferromagnetism vs. Superconductivity in a tight-binding model with singlet nearest-neighbour pairing interaction
Abstract
We study a tight-binding model with a singlet nearest-neighbour pairing interaction in two dimensions. In the strong-coupling limit the system undergoes an antiferromagnetic phase transition with a finite Neel temperature for all fillings. For this reason we include both an antiferromagnetic and a superconducting order parameter within the symmetry-broken Hartree-Fock approximation and derive the self-consistent phase diagram. In the half-filled state, the system orders antiferromagnetically; otherwise superconductivity occurs and might coexist with antiferromagnetism. The implications on the specific heat and the Pauli susceptibility are discussed. © 1995 Les Editions de Physique.