Correlation effects and non-collinear magnetism in the doped Hubbard model

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:383

Article; Proceedings Paper

Igoshev, P. A.^1,2  Timirgazin, M. A.³  Gilmutdinov, V. F.³  Arzhnikov, A. K.³  Irkhin, V. Yu¹ 

[1] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620990, Russia

[2] Ural Fed Univ, Ekaterinburg 620002, Russia

[3] Phys Tech Inst, Izheysk, Russia

关键词: Incommensurate magnetism;    Electronic correlation;    Band magnetism;   

DOI  :  10.1016/j.jmmm.2014.10.031

来源: Elsevier

【 摘 要 】

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. (C) 2014 Elsevier B.V. All rights reserved

【 授权许可】

Free