Spin-Peierls Instabilities vs Antiferromagnetic Transition and Phonon Dynamics
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概要
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We discuss a competition between a spin-Peter's state and the antiferromag-netic state for a Heisenberg antiferromagnetic linear chain system including aphonon Hamiltonian. A Hartree-Fock approximation is applied to a Hamiltonianredescribed in terms of spin-less fermions. We get Dyson's equation of phononswhich is consistent with this Hartree-Fock approximation. We point out thatPytte's work is not still complete even in the framework of the Hartree-locktheory since a term was left out there which gave a quantitative difference be-tween the Heisenberg model and the X Y model. We find the softening of pho-nons in the antiferromagnetic state which has overcome the spin-Peierls state.
- 社団法人日本物理学会の論文
- 1984-03-15
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