One-dimensional orbital fluctuations and the exotic magnetic properties of YVO$_3$

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dc.creatorOles, Andrzej M.
dc.creatorHorsch, Peter
dc.creatorKhaliullin, Giniyat
dc.date2007-06-17
dc.date.accessioned2026-07-07T08:10:42Z
dc.date.available2026-07-07T08:10:42Z
dc.descriptionStarting from the Mott insulator picture for cubic vanadates, we derive and investigate the model of superexchange interactions between V$^{3+}$ ions, with nearly degenerate $t_{2g}$ orbitals occupied by two electrons each. The superexchange interactions are strongly frustrated and demonstrate a strong interrelation between possible types of magnetic and orbital order. We elucidate the prominent role played by fluctuations of $yz$ and $xz$ orbitals which generate ferromagnetic superexchange interactions even in the absence of Hund's exchange. In this limit we find orbital valence bond state which is replaced either by $C$-type antiferromagnetic order with weak $G$-type orbital order at increasing Hund's exchange, or instead by $G$-type antiferromagnetic order when the lattice distortions stabilize $C$-type orbital order. Both phases are observed in YVO$_3$ and we argue that a dimerized $C$-type antiferromagnetic phase with stronger and weaker FM bonds alternating along the c axis may be stabilized by large spin-orbital entropy at finite temperature. This suggests a scenario which explains the origin of the exotic $C$-AF order observed in YVO$_3$ in the regime of intermediate temperatures and allows one to specify the necessary ingredients of a more complete future theory.
dc.description23 pages, 15 figures
dc.identifierhttps://arxiv.org/abs/0706.2475
dc.identifierhttp://arxiv.org/abs/0706.2475
dc.identifierPhys. Rev. B 75, 184434 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.184434
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/131898
dc.subjectStrongly Correlated Electrons
dc.titleOne-dimensional orbital fluctuations and the exotic magnetic properties of YVO$_3$
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