Quantum Disordered State without Frustration in the Double Layer Heisenberg antiferromagnet : Dimer Expansion and Projector Monte Carlo Study
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概要
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The quantum disordered state (QDOS) of the spin 1 /2 double layer square latticeHeisenberg antiferromagnet is studied. Using the dimer expansion from the limit ofthe large interlayer coupling J', the staggered susceptibility X, the antiferromagneticstructure factor .5. and the antiferromagnetic correlation length /. are calculated up tothe 6-th order in the intralayer coupling J. The ratio analysis shows that the QDOSbecomes unstable against the Neel ordering at J' /J : 2.56. The critical exponents arenot inconsistent with the universality class of the 3-dimensional classical Heisenbergmodel, suggesting that our QDOS corresponds to that expected in the 2-dimensionalsquare lattice Heisenberg antiferromagnet with unphysically small spin (<0.276).The results of the projector Monte Carlo simulation also confirms the dimer expan-sion results.[ double layer Heisenberg antiferromagnet, dimer expansion, quantum disor- lf dered state, projector Monte Carlo simulation%
- 社団法人日本物理学会の論文
- 1992-03-15
著者
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Hida K
Saitama Univ. Saitama
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Hida Kazuo
Department Of Physics Faculty Of Science Saitama University
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Hida Kazuo
Department Of Engineering Science Faculty Of Engineering Hokkaido University
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