On the method of double-time green functions in the theory of spin systems |
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| Authors: | V.L. Aksenov J. Schreiber |
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| Affiliation: | Joint Institute for Nuclear Research, Laboratory of Theoretical Physics, Dubna, USSR |
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| Abstract: | The thermodynamics of the Ising model in a transverse field is considered within RPA. Contrary to the conventional approach, the order parameter is determined by the free energy while the sum rules are used to check the accuracy for the computed correlation functions. |
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