Orbitally driven spin-singlet dimerization in $S$=1 La$_{4}$Ru$_{2}$O$_{10}$

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dc.creatorWu, Hua
dc.creatorHu, Z.
dc.creatorBurnus, T.
dc.creatorDenlinger, J. D.
dc.creatorKhalifah, P. G.
dc.creatorMandrus, D.
dc.creatorJang, L. -Y.
dc.creatorHsieh, H. H.
dc.creatorTanaka, A.
dc.creatorLiang, K. S.
dc.creatorAllen, J. W.
dc.creatorCava, R. J.
dc.creatorKhomskii, D. I.
dc.creatorTjeng, L. H.
dc.date2006-06-16
dc.date2006-06-20
dc.date.accessioned2026-07-07T07:12:43Z
dc.date.available2026-07-07T07:12:43Z
dc.descriptionUsing x-ray absorption spectroscopy at the Ru-$L_{2,3}$ edge we reveal that the Ru$^{4+}$ ions remain in the $S$=1 spin state across the rare 4d-orbital ordering transition and spin-gap formation. We find using local spin density approximation + Hubbard U (LSDA+U) band structure calculations that the crystal fields in the low temperature phase are not strong enough to stabilize the $S$=0 state. Instead, we identify a distinct orbital ordering with a significant anisotropy of the antiferromagnetic exchange couplings. We conclude that La$_{4}$Ru$_{2}$O$_{10}$ appears to be a novel material in which the orbital physics drives the formation of spin-singlet dimers in a quasi 2-dimensional $S$=1 system.
dc.description5 pages, 4 figures, and 1 table
dc.identifierhttps://arxiv.org/abs/cond-mat/0606445
dc.identifierhttp://arxiv.org/abs/cond-mat/0606445
dc.identifierPhys. Rev. Lett. 96, 256402 (2006)
dc.identifierdoi:10.1103/PhysRevLett.96.256402
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/112171
dc.subjectStrongly Correlated Electrons
dc.titleOrbitally driven spin-singlet dimerization in $S$=1 La$_{4}$Ru$_{2}$O$_{10}$
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