Mixed Heisenberg Chains. I. The Ground State Problem
H. Niggemann, G. Uimin, J. Zittartz
TL;DR
This paper investigates the ground state properties of alternating Heisenberg spin chains, revealing a hidden Ising symmetry caused by competing local spin-singlet formations between different spin states.
Contribution
It introduces a mechanism for competing interactions in alternating chains and uncovers hidden symmetries affecting the ground state.
Findings
Identification of local spin-singlet pairing mechanism.
Revelation of hidden Ising symmetry in the system.
Insights into the competition between spin-1 and spin-0 states.
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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