Orbital Dimerization and Dynamic Jahn-Teller Effect in NaTiSi$_2$O$_6$

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dc.creatorKonstantinović, M. J.
dc.creatorBrink, J. van den
dc.creatorPopović, Z. V.
dc.creatorMoshchalkov, V. V.
dc.creatorIsobe, M.
dc.creatorUeda, Y.
dc.date2002-10-09
dc.date2003-01-21
dc.date.accessioned2026-07-07T02:47:39Z
dc.date.available2026-07-07T02:47:39Z
dc.descriptionWe study with the Raman scattering technique two types of phase transitions in the pyroxene compounds NaMSi$_2$O$_6$ (with M=Ti, V, and Cr). In the quasi one-dimensional S=1/2 system NaTiSi$_2$O$_6$ we observe anomalous high-temperature phonon broadening and large changes of the phonon energies and line-widths across the phase transition at 210 K. The phonon anomalies originate from an orbital order-disorder phase transition and these results --combined with theoretical considerations-- indicate that the high temperature dynamical Jahn-Teller phase of NaTiSi$_2$O$_6$ exhibits a spontaneous breaking of translational symmetry into a dimerized, Jahn-Teller distorted, orbital ordered state under the formation of spin valence bonds. In S=1 NaVSi$_2$O$_6$ orbital degrees of freedom are strongly suppressed and the magnetic excitations are well described within a Heisenberg model, indicating that at T$_N$=19K this system orders antiferromagnetically.
dc.description4 pages, 4 figures embedded
dc.identifierhttps://arxiv.org/abs/cond-mat/0210191
dc.identifierhttp://arxiv.org/abs/cond-mat/0210191
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/20088
dc.subjectStrongly Correlated Electrons
dc.titleOrbital Dimerization and Dynamic Jahn-Teller Effect in NaTiSi$_2$O$_6$
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