Correlation Function <S^z_iS^z_j> in Spin-1/2 Alternating Heisenberg-XY Antiferromagnets in One Dimension
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概要
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We calculate the correlation function<,S7Sj) in the ground state of one dimen-sional spin-172 alternating antiferromagnetic Heisenberg model, taking the ,X'l-likeanisotropy into consideration. We use the phase Hamiltonian method developed byNakano and Fukuyama and apply the self-consistent harmonic approximation to thenon-harmonic terms in the phase Hamiltonian. The long-distance behavior of the correlation function is<,S7Sf)?(x/4) "'exp ( -x/4), where x is the distance betweenthe 7-th and 7-th spins. The correlation length 4 is proportional to the inverse of theenergy gap between the ground state and the first excited state. The results are cornpared with those of the exact numerical analysis of finite size systems and the MonteCarlo simulations.
- 社団法人日本物理学会の論文
- 1987-03-15
著者
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Okamoto Kiyomi
Department Of Physics Faculty Of Science Tokyo Institute Of Technology
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Okamoto Kiyomi
Department Of Applied Physics Faculty Of Science Tokyo Institute Of Technology
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