Charge and magnetic order in the 2D Falicov-Kimball model with Hund\n coupling at finite temperatures

2007/02/17 by R. Lemański, Lemanski, Romuald
Physics and Astronomy · #FOS: Physical sciences #Nonlinear Photonic Systems #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum chaos and dynamical systems #Strong Light-Matter Interactions #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.cond-mat/0702415

openalex publication_date 2007/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We perform a simplified analysis of finite temperature properties of the\ngeneralized Falicov-Kimball model with Hund coupling. The model is studied on\nthe square lattice for fixed values of \f-electron and \d-electron\ndensities \ρ_f=1/2, \ρ_d=1. Using an approxiamte scheme we estimated\nfree energies of the following three phases: the charge and spin ordered (SCO),\nthe charge ordered (CO) and the non-ordered (NO). Comparing the free energies\nwe detected phase transitions and found how the transition temperatures depend\non the on-site interaction parameters. It appears, that the transition\ntemperture between SCO and CO is much lower than between CO and NO, but their\nmaximum values are attained at values of coupling constants very close to each\nother.\n

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