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- W1796374418 abstract "This work studies the appearance of a Haldane gap in quasi one-dimensional antiferromagnets in the long wavelength limit, via the nonlinear $sigma$-model. The mapping from the three-dimensional, integer spin Heisenberg model to the nonlinear $sigma$-model is explained, taking into account two antiferromagnetic couplings: one along the chain axis ($J$) and one along the perpendicular planes ($J_bot$) of a cubic lattice. An implicit equation for the Haldane gap is derived, as a function of temperature and coupling ratio $J_bot/J$. Solutions to these equations show the existence of a critical coupling ratio beyond which a gap exists only above a transition temperature $T_N$. The cut-off dependence of these results is discussed." @default.
- W1796374418 created "2016-06-24" @default.
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- W1796374418 date "1993-12-01" @default.
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- W1796374418 title "Haldane gap in the quasi-one-dimensional nonlinear σ model" @default.
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- W1796374418 doi "https://doi.org/10.1103/physrevb.48.15880" @default.
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