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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:272

Article

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

关键词: pyroxenes;    Raman scattering;    orbital dimers;   

DOI  :  10.1016/j.jmmm.2003.11.328

来源: Elsevier

【 摘 要 】

The phonon dynamics in NaTiSi2O6 is studied using the Raman scattering technique. The observed phonon anomalies around T = 210 K combined with theoretical considerations show that the high-temperature dynamical Jahn - Teller phase of NaTiSi2O6 exhibits a spontaneous breaking of translational symmetry into an orbital dimerized state. We describe this phase instability as an orbital analogue of the spin-Peierls phase transition. (C) 2004 Elsevier B.V. All rights reserved.

【 授权许可】

Free