Title: Orbital dimerization in NaTiSi2O6: An orbital analogue of the spin-Peierls phase transition
Authors: Konstantinovic, MJ ×
van den Brink, J
Popovic, ZV
Moshchalkov, Victor
Isobe, M
Ueda, Y #
Issue Date: 2004
Series Title: Physical review. B, Condensed matter and materials physics vol:69 issue:2
Conference: date:Katholieke Univ Leuven, Lab Vaste Stoffys & Magnetisme, B-3001 Louvain, Belgium; Leiden Univ, Inst Lorentz Theoret Phys, NL-2300 RA Leiden, Netherlands; Univ Twente, Fac Appl Phys, NL-7500 AE Enschede, Netherlands; Inst Phys Belgrade, YU-11080 Belgrade, Yugoslavia; Univ Valencia, Inst Mat Sci, Valencia 46071, Spain; Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan
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.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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