ChemInform Abstract: Conformational Study of Dibenzo(d,g)(1,3)dioxocin‐12‐one by Vibrational Spectroscopy and Molecular Mechanics

Khaliullin, R. Sh.; Arshinova, R. P.; Anonimova, I. V.; Plyamovatyi, A. Kh.; Shagidullin, R. R.

doi:10.1002/chin.199136052

Cited by 1 publication

(2 citation statements)

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“…In strongly correlated transition-metal oxides, orbital interactions play a key role in many intriguing phenomena such as the colossal magnetoresistance or the effective reduction of dimensionality. 1,2,3,4 Orbitals on different sites interact with each other 5,6 via the collective Jahn-Teller effect, i.e., the coupling to the lattice, and via exchange interactions, which are governed by the antisymmetrization of the total wave function including both the orbital and the spin part. These interactions can result in coupled long-range spin and orbital order.…”

Section: Introductionmentioning

confidence: 99%

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Collective orbital excitations in orbitally ordered YVO₃and HoVO₃

Benckiser¹,

Rückamp²,

Möller³

et al. 2008

New J. Phys.

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We study orbital excitations in the optical absorption spectra of YVO3 and HoVO3. We focus on an orbital absorption band observed at 0.4 eV for polarization E c. This feature is only observed in the intermediate, monoclinic phase. By comparison with the local crystal-field excitations in VOCl and with recent theoretical predictions for the crystal-field levels we show that this absorption band cannot be interpreted in terms of a local crystal-field excitation. We discuss a microscopic model which attributes this absorption band to the exchange of two orbitals on adjacent sites, i.e., to the direct excitation of two orbitons. This model is strongly supported by the observed dependence on polarization and temperature. Moreover, the calculated spectral weight is in good agreement with the experimental result. arXiv:0803.3046v1 [cond-mat.str-el]

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Section: Introductionmentioning

confidence: 99%

“…At T S = 77 K a first-order structural phase transition to an intermediate, monoclinic phase with P2 1 /b symmetry has been observed. This monoclinic phase shows two different vanadium sites, V(1) and V (2), which alternate along the c axis. Therefore, the mirror symmetry perpendicular to the ab plane is broken in the intermediate phase.…”

Section: Introductionmentioning

confidence: 99%