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Ferromagnetism and phase separation in one-dimensional d-p and periodic Anderson models | | M. Guerrero
; R.M. Noack
; | | Date: |
17 Apr 2000 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | Using the Density Matrix Renormalization Group, we study metallic ferromagnetism in a one-dimensional copper-oxide model which contains one oxygen p-orbital and one copper d-orbital. The parameters for the d-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. | | Source: | arXiv, cond-mat/0004265 | | Services: | Forum | Review | PDF | Favorites | |
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