Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 23, Pages 4960-4963Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.4960
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The ground-state properties of the spin-1 antiferromagnetic Heisenberg model on the comer-sharing tetrahedra, the pyrochlore lattice, are investigated. By breaking up each spin into a pair of 1/2-spins, the problem is reduced to the equivalent one of the spin-1/2 tetrahedral network in analogy with the valence bond solid state in one dimension. The twofold degeneracy of the spin singlets of a tetrahedron is lifted by a Jahn-Teller mechanism, leading to a cubic to tetragonal structural transition, it is proposed that the present mechanism is responsible for the phase transition observed in the spin-1 spinel compounds ZnV2O4 and MgV2O4.
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