Magnetic phase transitions and unusual antiferromagnetic states in the Hubbard model

被引：8

作者：

Igoshev, P. A. ^{[1
,3
]}

Timirgazin, M. A. ^{[2
]}

Arzhnikov, A. K. ^{[2
]}

Irkhin, V. Yu. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620108, Russia

[2] Phys Tech Inst, Kirov Str 132, Izhevsk 426000, Russia

[3] Ural Fed Univ, Ekaterinburg 620002, Russia

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2018年 / 459卷

基金：

俄罗斯基础研究基金会;

关键词：

Hubbard model; Slave bosons; Non-collinear magnetism; Antiferromagnetism; Frustration; NARROW ENERGY-BANDS; SINGLE-PARTICLE EXCITATIONS; ELECTRON CORRELATIONS; QUANTUM ANTIFERROMAGNET; S-BAND; FERROMAGNETISM; INSTABILITY; SPIN;

D O I：

10.1016/j.jmmm.2017.10.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ground state magnetic phase diagrams of the square and simple cubic lattices are investigated for the narrow band Hubbard model within the slave-boson approach by Kotliar and Ruckenstein. The transitions between saturated (half-metallic) and non-saturated ferromagnetic phases as well as similar transition in antiferromagnetic (AFM) state are considered in the three-dimensional case. Two types of saturated antiferromagnetic state with different concentration dependences of sublattice magnetization are found in the two-dimensional case in the vicinity of half-filling: the state with a gap between AFM subbands and AFM state with large electron mass. The latter state is hidden by the phase separation in the finite-U case. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：311 / 316

页数：6

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