Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-12-05
Phys. Rev. B, 81, 094407 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
19 pages, 7 figures
Scientific paper
10.1103/PhysRevB.81.094407
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.
Arzhnikov A. K.
Igoshev Andrei P.
Irkhin Yu. V.
Katanin Andrey A.
Timirgazin M. A.
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