DOPING-INDUCED INCOMMENSURATE ANTIFERROMAGNETISM IN A MOTT-HUBBARD INSULATOR

被引:87
作者
ARRIGONI, E
STRINATI, GC
机构
[1] Scuola Normale Superiore
来源
PHYSICAL REVIEW B | 1991年 / 44卷 / 14期
关键词
D O I
10.1103/PhysRevB.44.7455
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Properties of incommensurate spiral spin phases are calculated at the mean-field level for a single-band Hubbard Hamiltonian with variable hole density, by adapting both the Hartree-Fock decoupling and the Kotliar-Ruckenstein slave-boson approach to a regular twist of the spin quantization axes from site to site in a two-dimensional square lattice. The relative stability of the (1,1) and (1,0) spiral phases, the coexistence of the antiferromagnetic and the spiral phases over a finite range of hole density, and the stiffness of the spirals against fluctuations of their direction and pitch are discussed within the model Hamiltonian over a wide range of hole density and interaction strength.
引用
收藏
页码:7455 / 7465
页数:11
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