Correlation effects and non-collinear magnetism in the doped Hubbard model
| Autor: | M. A. Timirgazin, V.F. Gilmutdinov, V. Yu. Irkhin, P. A. Igoshev, A. K. Arzhnikov |
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| Rok vydání: | 2015 |
| Předmět: |
NON-COLLINEAR MAGNETISM
Hubbard model Magnetism FOS: Physical sciences Slave boson CORRELATION EFFECT MAGNETISM FERROMAGNETISM MAGNETIC PHASE DIAGRAMS Condensed Matter - Strongly Correlated Electrons ANTIFERROMAGNETISM PHASE SEPARATION HUBBARD MODEL Antiferromagnetism Spiral Physics Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Electronic correlation ELECTRONIC CORRELATION BAND MAGNETISM ANTIFERROMAGNETICS Condensed Matter Physics CORRELATION DETECTORS Electronic Optical and Magnetic Materials ELECTRONIC PHASE SEPARATION MAGNETIC FIELD EFFECTS GROUND STATE Ferromagnetism Condensed Matter::Strongly Correlated Electrons HARTREE APPROXIMATION Ground state INCOMMENSURATE MAGNETISM |
| Zdroj: | J Magn Magn Mater Journal of Magnetism and Magnetic Materials |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2014.10.031 |
| Popis: | The ground--state magnetic phase diagram is investigated for the two-- and three--dimensional $t$--$t'$ Hubbard model. We take into account commensurate ferro--, antiferromagnetic, and incommensurate (spiral) magnetic phases, as well as phase separation into magnetic phases of different types, which was often missed in previous investigations. We trace the influence of correlation effects on the stability of both spiral and collinear magnetic order by comparing the results of employing both the generalized non-correlated mean--field (Hartree--Fock) approximation and generalized slave boson approach by Kotliar and Ruckenstein with correlation effects included. We found that the spiral states and especially ferromagnetism are generally strongly suppressed up to non-realistic large Hubbard $U$, if the correlation effects are taken into account. The electronic phase separation plays an important role in the formation of magnetic states and corresponding regions are wide, especially in the vicinity of half--filling. The details of magnetic ordering for different cubic lattices are discussed. Invited Report on the Moscow International Symposium on Magnetism MISM-2014, 6 pages, final version |
| Databáze: | OpenAIRE |
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