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

M. J. Konstantinović, J. van den Brink, Z. V. Popović +3

We 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 syst…