Incommensurate magnetic order and phase separation in the two-dimensional Hubbard model with nearest and next-nearest neighbor hopping

We consider the ground state magnetic phase diagram of the two-dimensional Hubbard model with nearest and next-nearest neighbor hopping in terms of electronic density and interaction. We treat commensurate ferro- and antiferromagnetic, as well as incommensurate (spiral) magnetic phases. The first-or...

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Bibliographic Details
Published in:arXiv.org 2009-12
Main Authors: Igoshev, P A, Timirgazin, M A, Katanin, A A, Arzhnikov, A K, V Yu Irkhin
Format: Article
Language:English
Subjects:
Antiferromagnetism
Chemical potential
Cuprates
Density
Ferromagnetism
Magnetic properties
Magnetic transitions
Organic chemistry
Phase diagrams
Phase separation
Phases
Two dimensional models
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Summary:We consider the ground state magnetic phase diagram of the two-dimensional Hubbard model with nearest and next-nearest neighbor hopping in terms of electronic density and interaction. We treat commensurate ferro- and antiferromagnetic, as well as incommensurate (spiral) magnetic phases. The first-order magnetic transitions with changing chemical potential, resulting in a phase separation (PS) in terms of density, are found between ferromagnetic, antiferromagnetic and spiral magnetic phases. We argue that the account of PS has a dramatic influence on the phase diagram in the vicinity of half-filling. The results imply possible interpretation of the unusual behavior of magnetic properties of one-layer cuprates in terms of PS between collinear and spiral magnetic phases. The relation of the results obtained to the magnetic properties of ruthenates is also discussed.
ISSN:2331-8422
DOI:10.48550/arxiv.0912.0992