Spin Wave Theoty of the Two-Dimensional Heisenberg Antiherromagnet Coupled with Localized Holes
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概要
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The spin wave theory of the two-dimensional Heisenberg antiferromagnet on asquare lattice coupled with localized holes, i.e., extra spins, is investigated. Thismodel is a limiting case of the coupled spin-fermion model presented recently to investigate the magnetic mechanism of high-7'. superconductivity. Two schemes of thespin wave theory are proposed according to the relative magnitude of J. (coupling be-tween the extra and the substrate spins) to J. (coupling between the substrate spins).The following conclusions are obtained. (1) Small antiferromagnetic (AF) J. as wellas ferromagnetic (F) J. enhances the AF long-range order suppressing the quantumfluctuations. Large AF J., however, reduces the AF long-range order and enhancesthe quantum fluctuations. We obtain the large attractive interaction only in the lattercase. (2) The susceptibility z. perpendicular to the staggered magnetization islogarithmically divergent with respect to the external frequency co when one extraspin is introduced.
- 社団法人日本物理学会の論文
- 1989-03-15
著者
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NAGAOSA Naoto
Department of Applied Physics, University of Tokyo
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IMADA Masatoshi
Department of Applied Physics, University of Tokyo
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Nagaosa Naoto
Department Of Applied Physics Faculty Of Engineering University Of Tokyo
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HATSUGAI Yasuhiro
Department of Applied Physics, University of Tokyo
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