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- W2034366372 abstract "Abstract Stimulated by the spin gap observed for CaV4O9 we examine the ground state of the spin - 1 2 Heisenberg model on the square lattice with two different antiferromagnetic regular nearest-neighbour bonds J1 and J2. In the classical limit the ground state is Neel ordered for the whole range of parameters J1 > 0 and J2 > 0. The quantum model is Neel-like ordered for J2 ≈ J1. However, with increasing J2, i.e. J2 > J1, is the quantum fluctuations lead to a melting of the Neel-type order for a critical ratio J2/J1. The order-disorder transition is accompanied by the opening of an excitation gap (spin gap)." @default.
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- W2034366372 date "1997-02-01" @default.
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- W2034366372 title "Order-disorder transition in a 2d Heisenberg quantum antiferromagnet with competing nearest-neighbour bonds" @default.
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- W2034366372 doi "https://doi.org/10.1016/s0921-4526(96)00796-x" @default.
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