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

Konstantinovic, M.J. and Brink van den, J. and Popovic, Z.V. and Moshchalkov, V.V. and Isobe, M. and Ueda, Y. (2004) Orbital dimerization in NaTiSi2O6: An orbital analogue of the spin-Peierls phase transition. Physical Review B: Condensed matter and materials physics, 69 (2). 020409. ISSN 1098-0121

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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.
Item Type:	Article
Copyright:	© 2004 The American Physical Society
Research Group:	Computational Materials Science (CMS)
Link to this item:	http://purl.utwente.nl/publications/57592
Official URL:	http://dx.doi.org/10.1103/PhysRevB.69.020409
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