Abstract
The Kramers–Wannier transfer matrix method is generalized to an arbitrary decoration number of the Ising chain. An exact analytical expression is obtained for the largest eigenvalue of the transfer matrix of a decorated Ising chain in the presence of an external magnetic field. Frustration points and the values of frustration magnetic fields are found that depend on the magnitudes and signs of exchange interactions. Exact expressions are obtained for zero-temperature entropies and zero-temperature magnetizations of the model under consideration. Magnetic phase diagrams of the ground state of the system are constructed for decoration values of d = 1 and d = 2, including those in the absence of a magnetic field. A comparison is made with a decorated square lattice not only in the absence but also in the presence of a magnetic field.
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Funding
This work was supported by the Ministry of Education and Science of the Russian Federation within the state assignment (projects “Kvant,” no. AAAA-A18-118020190095-4, and “Splavy,” no. AAAA-A19-119070890020-3) and in part by the Ural Branch of the Russian Academy of Sciences (project no. 18-2-2-11).
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Translated by I. Nikitin
APPENDIX
APPENDIX
To take the integral in (32), we apply the following formula [23]:
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Tsuvarev, E.S., Kassan-Ogly, F.A. Decorated Ising Chain in a Magnetic Field. J. Exp. Theor. Phys. 131, 976–987 (2020). https://doi.org/10.1134/S1063776120120122
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DOI: https://doi.org/10.1134/S1063776120120122