2000/04/17 by M. Guerrero, R. M. Noack · 2 citations
Mathematics · Physics and Astronomy · #Algorithm #Computer science #Magnetic properties of thin films #Mathematics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.63.144423
12 pages (RevTeX), 12 figures (EPS)
arxiv created 2000/04/17 · openalex publication_date 2001/03/21 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using the density matrix renormalization group, we study metallic ferromagnetism in a one-dimensional copper-oxide model that contains one oxygen p orbital and one copper d orbital. The parameters for the d\ensuremath-p model can be chosen so that it is similar to the one-dimensional periodic Anderson model. For these parameters, we compare the ground-state phase diagram with that of the Anderson model and find a ferromagnetic region analogous to one found in the Anderson model, but which is pushed to somewhat higher densities and interaction strengths. In both models, we find a region within the ferromagnetic phase in which phase separation between a localized ferromagnetic domain and a weakly antiferromagnetic regime occurs. We then choose a set of parameter values appropriate for copper-oxide materials and explore the ground-state phase diagram as a function of the oxygen-oxygen hopping strength and the electron density. We find three disconnected regions of metallic ferromagnetism and give physical pictures of the three different mechanisms for ferromagnetism in these phases.