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题名: SELF-CONSISTENT MEAN-FIELD THEORY OF A SPIN-1 ANTIFERROMAGNETIC CHAIN
作者: WANG, HT ;  SHEN, JL ;  LI, KR ;  SU, ZB
刊名: PHYSICAL REVIEW B
出版日期: 1994
卷号: 49, 期号:18, 页码:12805-12812
关键词: ONE-DIMENSIONAL ANTIFERROMAGNETS ;  GROUND-STATE PROPERTIES ;  MONTE-CARLO CALCULATION ;  QUANTUM ENERGY-GAP ;  HALDANE-GAP ;  HEISENBERG CHAIN ;  WAVE THEORY ;  DYNAMICAL PROPERTIES ;  UNIAXIAL ANISOTROPY ;  NEUTRON-SCATTERING
学科分类: Physics
通讯作者: WANG, HT , CHINESE CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
部门归属: ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA; ACAD SINICA,INST PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要: We develop an extended self-consistent mean-field approach to study a spin-1 antiferromagnetic (AF) chain with the Hamiltonian H=SIGMA(i) [S(i)(x)S(i+1)x + S(i)(y)S(i+1)y + lambdaS(i)(z)S(i+1)z + D(S(i)z)2] based on Anderson's spin-wave theory. The ground-state energy changes little compared with the traditional spin-wave theory and the excitation spectrum shows a gap which lends support to Haldane's conjecture. At the Heisenberg point (lambda = 1,D = 0), the ground-state energy and the gap are - 1. 3505 and 0.3914, respectively. In the Heisenberg-Ising case lambda > 0, D = 0), the gap decreases when lambda goes down from 1 and at a critical lambda(c) > 0 the pp goes to 0, while for the single-ion anisotropy (lambda = 1, D > 0) the gap decreases with the increasing of D and at a critical value D(c) the gap goes to 0. These results agree well with those of other theoretical methods and experiments. We study the one-magnon excitation spectrum carefully and suggest an explanation for its crossing with the two-magnon excitation spectrum at low momentum. We estimate the crossing occurring at k congruent-to 0.3pi. The results agree well with the very recent theoretical and experimental results. The picture of the Haldane gap is discussed from our extended self-consistent mean-field ground state and many interesting properties of the spin-1 AF chain are discussed.
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/311006/11913
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Recommended Citation:
WANG, HT,SHEN, JL,LI, KR,et al. SELF-CONSISTENT MEAN-FIELD THEORY OF A SPIN-1 ANTIFERROMAGNETIC CHAIN[J]. PHYSICAL REVIEW B,1994,49(18):12805-12812.
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