Publicação: Kondo-attractive-Hubbard model for the ordering of local magnetic moments in superconductors
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Amer Physical Soc
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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.
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antiferromagnetic materials, binding energy, boron compounds, dysprosium compounds, ground states, holmium compounds, Hubbard model, Kondo effect, magnetic moments, nickel compounds, phase diagrams, renormalisation, spin density waves, superconducting materials, thulium compounds
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Inglês
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Physical Review B. College Pk: Amer Physical Soc, v. 79, n. 22, p. 4, 2009.
