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26 April 2024

» arxiv » 1003.1666

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Dynamical Dzyaloshinsky-Moriya interaction in KCuF3: Raman evidence for an antiferrodistortive lattice instability
V. Gnezdilov ; J. Deisenhofer ; P. Lemmens ; D. Wulferding ; O. Afanasiev ; P. Ghigna ; A. Loidl ; A. Yeremenko ;
Date:	8 Mar 2010
Abstract:	In the orbitally ordered, quasi-one dimensional Heisenberg antiferromagnet KCuF3 the low-energy Eg and B1g phonon modes show an anomalous softening (25% and 13%) between room temperature and the characteristic temperature T_S = 50 K. In this temperature range a freezing-in of F ion dynamic displacements is proposed to occur. In addition, the Eg mode at about 260 cm-1 clearly splits below T_S. The width of the phonon lines above T_S follows an activated behavior with an activation energy of about 50 K. Our observations clearly evidence a reduction of the structural symmetry below T_S and indicate a strong coupling of lattice and spin fluctuations for T>T_S.
Source:	arXiv, 1003.1666
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