Enhancement of the d-wave pairing correlations by charge and spin ordering in the spin-one-half Falicov-Kimball model with Hund and Hubbard~coupling

Abstract

Projector Quantum-Monte-Carlo Method is used to examine effects of the spin-independent $U_{fd}$ as well as spin-dependent $J_z$ Coulomb interaction between the localized $f$ and itinerant $d$ electrons on the stability of various types of charge/spin ordering and superconducting correlations in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling. The model is studied for a wide range of $f$ and $d$-electron concentrations and it is found that the interband interactions $U_{fd}$ and $J_z$ stabilize three basic types of charge/spin ordering, and namely, (i) the axial striped phases, (ii) the regular $n$-molecular phases and (iii) the phase separated states. It is shown that the d-wave pairing correlations are enhanced within the axial striped and phase separated states, but not in the regular phases. Moreover, it was found that the antiferromagnetic spin arrangement within the chains further enhances the d-wave paring correlations, while the ferromagnetic one has a fully opposite effect.

arXiv comment17 pages, 6 figures

References in corpus (10)

• Correlated Electrons in High Temperature Superconductors
• Coexistence of, and Competition between, Superconductivity and Charge-Stripe Order in La(1.6-x)Nd(0.4)Sr(x)CuO(4)
• Stripe phases in the two-dimensional Falicov-Kimball model
• Model of charge and magnetic order formation in itinerant electron systems
• Determinant Quantum Monte Carlo Study of the Enhancement of d-wave Pairing by Charge Inhomogeneity
• Dynamic cluster quantum Monte Carlo simulations of a two-dimensional Hubbard model with stripe-like charge density wave modulations: Interplay between inhomogeneity and superconductivity
• Ground states of the generalized Falicov-Kimball model in one and two dimensions
• Ground-state phase diagrams of the generalized Falicov-Kimball model with Hund coupling
• Phase transitions induced by correlated hopping in the Falicov-Kimball model
• Parallelization of the exact diagonalization of the t-t'-Hubbard model

Cited by in corpus (1)

• Influence of spin ordering on superconducting correlations in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling