Mixed spin ladders with exotic ground states |
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| Authors: | A.K. Kolezhuk H.-J. Mikeska |
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| Affiliation: | Institut für Theoretische Physik, Universit?t Hannover, Appelstrasse 2, 30167 Hannover, Germany, DE
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| Abstract: | We study the “mixed spin” isotropic ladder system having S=1 spins on one leg and S=1/2 spins on the other, with general-type exchange interactions between spins on neighboring rungs. A set of model Hamiltonians with exact ground states in the form of a certain matrix product wave function is obtained. We show that sufficiently strong frustration can lead to exotic singlet ground states with infinite (exponential) degeneracy. We also list a couple of rather simple models with nontrivial ground states, including a model with only bilinear exchange. Received: 2 December 1997 / Accepted: 28 January 1998 |
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| Keywords: | PACS. 75.10.Jm Quantized spin models - 75.50.Ee Antiferromagnetics - 75.30.Kz Magnetic phase boundaries (including magnetic transitions metamagnetism etc.) |
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