Kondo–attractive-Hubbard model for the ordering of local magnetic moments in superconductors

Pedro R. Bertussi; André L. Malvezzi; Thereza Paiva; Raimundo R. dos Santos

doi:10.1103/PhysRevB.79.220513

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Kondo–attractive-Hubbard model for the ordering of local magnetic moments in superconductors

Pedro R. Bertussi, André L. Malvezzi, Thereza Paiva, Raimundo R. dos Santos

DOI 10.1103/PhysRevB.79.220513 · Physical Review B

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Abstract

We consider local magnetic moments coupled to conduction electrons with on-site attraction in order to discuss the interplay between pairing and magnetic order. We probe the ground-state properties of this model on a one-dimensional lattice through pair binding energies and several correlation functions calculated by means of density-matrix renormalization group. A phase diagram is obtained (for fixed electron density 1/3) from which we infer that coexistence between magnetic order and superconductivity is robust at the expense of a continuous distortion of the magnetic arrangement of the local moments as evidenced by a strong dependence of the characteristic wave vector k∗ on the coupling constants. This allows us to understand some trends of the coexistence, such as the influence of the rare earth on k∗, as observed experimentally in the borocarbides.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown