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- W2018127117 abstract "The spin wave theory of the two-dimensional Heisenberg antiferromagnet on a square lattice coupled with localized holes, i.e., extra spins, is investigated. This model is a limiting case of the coupled spin-fermion model presented recently to investigate the magnetic mechanism of high- T c superconductivity. Two schemes of the spin wave theory are proposed according to the relative magnitude of J K (coupling between the extra and the substrate spins) to J S (coupling between the substrate spins). The following conclusions are obtained. (1) Small antiferromagnetic (AF) J K as well as ferromagnetic (F) J K enhances the AF long-range order suppressing the quantum fluctuations. Large AF J K , however, reduces the AF long-range order and enhances the quantum fluctuations. We obtain the large attractive interaction only in the latter case. (2) The susceptibility χ ⊥ perpendicular to the staggered magnetization is logarithmically divergent with respect to the external frequency ω when one extra spin is introduced." @default.
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- W2018127117 date "1989-03-15" @default.
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- W2018127117 title "Spin Wave Theory of the Two-Dimensional Heisenberg Antiferromagnet Coupled with Localized Holes" @default.
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- W2018127117 doi "https://doi.org/10.1143/jpsj.58.978" @default.
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