Spin-Peierls Transition with Competing Interactions
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概要
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The one-dimensional spin- l /2 Heisenberg antiferromagnet which has next-nearest-,as well as nearest-neighbor exchange interaction and couples to the lattice distortionis investigated. The next-nearest-neighbor interaction is shown to result from thenon-adiabaticity of the lattice distortion or the itineracy of electrons. The groundstate of this system is studied by the renormalization group method. In the absence ofthe coupling to the lattice distortion, the phase diagram consists of three states, i.e.,the spin-fluid, the dimer and the Neel state, in essential agreement with Haldane,while in its presence, there are two states, the spin-Peierls and the N<:el state. Theenergy gain due to the lattice distortion is estimated by the self-consistent harmonicapproximation.
- 社団法人日本物理学会の論文
- 1987-09-15
著者
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Fukuyama Hidetoshi
Institute For Solid State Physics The University Of Tokyo
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Kuboki Kazuhiro
Institute For Solid State Physics The University Of Tokyo
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