Valence bond crystal in a pyrochlore antiferromagnet with orbital degeneracy

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dc.creatorDi Matteo, S.
dc.creatorJackeli, G.
dc.creatorLacroix, C.
dc.creatorPerkins, N. B.
dc.date2004-04-06
dc.date2004-06-23
dc.date.accessioned2026-07-07T02:57:28Z
dc.date.available2026-07-07T02:57:28Z
dc.descriptionWe discuss the ground state of a pyrochlore lattice of threefold-orbitally-degenerate $S=1/2$ magnetic ions. We derive an effective spin-orbital Hamiltonian and show that the orbital degrees of freedom can modulate the spin exchange, removing the infinite spin-degeneracy characteristic of pyrochlore structures. The resulting state is a collection of spin-singlet dimers, with a residual degeneracy due to their relative orientation. This latter is lifted by a magneto-elastic interaction, induced in the spin-singlet phase-space, that forces a tetragonal distortion. Such a theory provides an explanation for the helical spin-singlet pattern observed in the B-spinel MgTi$_2$O$_4$.
dc.descriptionsome changes in the text; to appear in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/0404127
dc.identifierhttp://arxiv.org/abs/cond-mat/0404127
dc.identifierPhys. Rev. Lett. 93, 077208 (2004)
dc.identifierdoi:10.1103/PhysRevLett.93.077208
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23677
dc.subjectStrongly Correlated Electrons
dc.titleValence bond crystal in a pyrochlore antiferromagnet with orbital degeneracy
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