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Lattice vibrations in KCuF 3
Author(s) -
Deisenhofer J.,
Schmidt M.,
Wang Zhe,
Kant Ch.,
Mayr F.,
Schrettle F.,
Krug von Nidda H.A.,
Ghigna P.,
Tsurkan V.,
Loidl A.
Publication year - 2011
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201100026
Subject(s) - tetragonal crystal system , phonon , condensed matter physics , infrared , lattice vibration , vibration , physics , lattice (music) , polarization (electrochemistry) , normal mode , materials science , optics , quantum mechanics , chemistry , phase (matter) , acoustics
We report on polarization dependent reflectivity measurements in KCuF 3 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.