Lattice vibrations in KCuF3 (pages 645–651)
J. Deisenhofer, M. Schmidt, Zhe Wang, Ch. Kant, F. Mayr, F. Schrettle, H.-A. Krug von Nidda, P. Ghigna, V. Tsurkan and A. Loidl
Article first published online: 13 SEP 2011 | DOI: 10.1002/andp.201100026
The authors 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. A splitting of one mode already at 150 K and the appearance of a new mode in the vicinity of the Néel temperature is observed.