Orbital dimerization in NaTiSi2O6: An orbital analogue of the spin-Peierls phase transition

M.J. Konstantinovic, J. van den Brink, Z.V. Popovic, V.V. Moshchalkov, M. Isobe, Y. Ueda

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Abstract

We measure the Raman scattering spectra of NaTiSi2O6, analyze the vibrational properties, and study the origin of the phase transition in this compound. In this quasi-one-dimensional S = 1/2 system we observe anomalous high-temperature phonon broadenings, and large changes of the phonon energies and line-widths across the phase transition temperature of 210 K. These results, combined with theoretical considerations, indicate that the phonon anomalies originate from an orbital order-disorder type of phase transition. We find that the high temperature dynamical Jahn-Teller phase of NaTiSi2O6 exhibits a spontaneous breaking of translational symmetry into a dimerized, Jahn-Teller distorted, orbital ordered state under the formation of spin valence bonds.
Original languageUndefined
Article number020409
Pages (from-to)-
Number of pages4
JournalPhysical review B: Condensed matter and materials physics
Volume69
Issue number2
DOIs
Publication statusPublished - 2004

Keywords

  • METIS-272751
  • IR-57592

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