期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 459, 期 -, 页码 311-316出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2017.10.007
关键词
Hubbard model; Slave bosons; Non-collinear magnetism; Antiferromagnetism; Frustration
资金
- Ural Division of RAS [15-8-2-9, 15-8-2-12]
- Russian Foundation for Basic Research [16-02-00995]
- Act 211 Government of the Russian Federation [02.A03.21.0006]
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.
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