SEARCH

SEARCH BY CITATION

Keywords:

  • Infrared spectroscopy;
  • orbital ordering;
  • Jahn-Teller distortion.

Abstract

We report on polarization dependent reflectivity measurements in KCuF3 in the far-infrared frequency regime. The observed IR active phonons at room temperature are in agreement with the expected modes for tetragonal symmetry. We observe a splitting of one mode already at 150 K and the appearance of a new mode in the vicinity of the Néel temperature.