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• W2015635618 startingPage "13352" @default.
• W2015635618 abstract "We use the cluster-variation method to examine the phase diagram of the spin-1/2 XXZ model. The clusters used consist of two neighboring spins. With this method, we calculate global phase diagrams for arbitrary values of the anisotropy ${mathit{J}}_{mathit{z}}$/J and for arbitrary external magnetic fields. Lattices with different values of the coordination number z are considered. Analytic expressions are found for nearly all phase boundaries; the remaining phase boundary is located numerically. Despite some problems at low temperature, the results based on this approach are in quite good agreement with the results from series-expansion methods. A connection is made with the Hubbard model, which can be mapped onto the XXZ Hamiltonian in the limit of strong on-site attraction." @default.
• W2015635618 created "2016-06-24" @default.
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• W2015635618 date "1991-06-01" @default.
• W2015635618 modified "2023-09-25" @default.
• W2015635618 title "Cluster-variation approach to the spin-1/2<i>XXZ</i>model" @default.
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• W2015635618 doi "https://doi.org/10.1103/physrevb.43.13352" @default.
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