Thermodynamic Properties of Spin 1/2 Antiferromagnetic Heisenberg Model on the Square Lattice
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概要
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Thermodynamic properties of spin 1 /2 antiferromagnetic Heisenberg model are investigated by a quantum Monte Carlo method. Fluctuation of the order parameter,namely the square of staggered magnetization, shows large enhancement at low fern-peratures. Size dependence of the order parameter in the ground state is investigatedand it is fitted by a form with a power law dependence on the size which means thatthe long range order does not exist although the fluctuation diverges. Staggeredsusceptibility, namely the canonical (Kubo's) correlation of staggered magnetization,is also investigated and is found to be largely suppressed by quantum fluctuation cornpared with the square of staggered magnetization. Susceptibility for the uniform fieldis found to have a broad peak.
- 社団法人日本物理学会の論文
- 1988-06-15
著者
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Miyashita Seiji
Department Of Physics Faculty Of Science University Of Tokyo:department Of Physics College Of Libera
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Miyashita Seiji
Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo
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