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题名: FLUX PHASE AND DOPING DEPENDENCE OF ANTIFERROMAGNETISM IN COPPER-OXIDE COMPOUNDS
作者: FENG, SP
刊名: PHYSICA C
出版日期: 1994
卷号: 232, 期号:40910, 页码:119-126
关键词: VALENCE-BOND STATE ;  MEAN-FIELD-THEORY ;  T-J-MODEL ;  SPIN-LIQUID STATE ;  HEISENBERG-MODEL ;  HUBBARD-MODEL ;  DOPED ANTIFERROMAGNET ;  MOMENTUM DISTRIBUTION ;  SQUARE LATTICE ;  WAVE-FUNCTIONS
学科分类: Physics
部门归属: ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要: The ground-state properties of copper oxide compounds are studied by using the fermion-spin transformation. At half-filling, there are many possible phases for the 2D Heisenberg model and the mean-field state with the lowest energy is the magnetized pi-flux state. It is shown that the mean-field ground state of the 2D XY model is a uniform pi-flux phase with no staggered antiferromagnetic long-range order, and a reasonable result is also obtained for the 2D anisotropic Heisenberg model. In the mean-field level, the quantum fluctuation and frustration of spins can be considered by introducing the next-nearest-neighbor magnetic exchange interaction J', the antiferromagnetic long-range order is destroyed at half-fitting within the J-J' model where the value of J' is larger than the critical value J'(c) = 0.24J. Away from half-filling, the antiferromagnetic long-range order is destroyed for a hole concentration less than approximately 4.3%-7% for reasonable values of the parameters J'/J = 0.05 and t/J = 3-5 within the t-J-J' model, which is in good agreement with the experiments on copper oxide superconductors.
收录类别: SCI
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/11844
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
FENG, SP. FLUX PHASE AND DOPING DEPENDENCE OF ANTIFERROMAGNETISM IN COPPER-OXIDE COMPOUNDS[J]. PHYSICA C,1994,232(40910):119-126.
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