Ground-State Energy of a Frustrated ±J Ising Model on a Strip of Squares |

M. Błaszyk and B. FechnerInstitute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |

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We investigated a ±J Ising model on an infinite strip of squares of the width of one and two bonds with a random distribution of ferro- and antiferromagnetic exchange interactions. The exact ground-state energy as a function of the concentration of antiferromagnetic bonds was derived and its singular points in the complex-plane were found. |

DOI: 10.12693/APhysPolA.97.855 PACS numbers: 05.50.+q, 75.10.Nr, 75.50.Lk |