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- W2084098178 abstract "Square lattice Heisenberg and $XY$ antiferromagnets with uniaxial anisotropy are studied in a field along the easy axis. Based on ground-state considerations and Monte Carlo simulations, the role of biconical structures in the transition region between the antiferromagnetic and spin-flop phases is analyzed. In particular, on adding a single-ion anisotropy to the $XXZ$ antiferromagnet, one observes, depending on the sign of that anisotropy, either an intervening biconical phase or a direct transition of first order separating the two phases. In the case of the anisotropic $XY$ model, the degeneracy of the ground state, at a critical field, in antiferromagnetic, spin-flop, and bidirectional structures seems to result, as in the case of the $XXZ$ model, in a narrow disordered phase between the antiferromagnetic and spin-flop phases, dominated by bidirectional fluctuations." @default.
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- W2084098178 date "2007-12-17" @default.
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- W2084098178 title "Biconical structures in two-dimensional anisotropic Heisenberg antiferromagnets" @default.
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- W2084098178 doi "https://doi.org/10.1103/physrevb.76.220405" @default.
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