Mixed Heisenberg chains: I. The ground-state problem

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, , Citation Harald Niggemann et al 1997 J. Phys.: Condens. Matter 9 9031 DOI 10.1088/0953-8984/9/42/017

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1 Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany

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  1. Received 2 April 1997

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0953-8984/9/42/9031

Abstract

We consider a mechanism for competing interactions in alternating Heisenberg spin chains due to the formation of local spin-singlet pairs. The competition of spin-1 and spin-0 states reveals hidden Ising symmetry of such alternating chains.

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10.1088/0953-8984/9/42/017