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

P. A. Igoshev, M. A. Timirgazin, A. A. Katanin, A. K. Arzhnikov, V. Yu Irkhin

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85 Citations (Scopus)

Abstract

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 strength. We treat commensurate ferromagnetic 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 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 single-layer cuprates in terms of PS between collinear and spiral magnetic phases. The relevance of our results to the magnetic properties of the ruthenates is also discussed.

Original languageEnglish
Article number094407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number9
DOIs
Publication statusPublished - 5 Mar 2010
Externally publishedYes

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