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Giant Kohn Anomaly and the Phase Transition in Charge Density Wave ZrTe3

By Moritz Hoesch, Alexey Bosak, Dmitry Chernyshov, Helmuth Berger and Michael Krisch


A strong Kohn anomaly in ZrTe3 is identified in the mostly transverse acoustic phonon branch along the modulation vector q(P) with polarization along the a(*) direction. This soft mode freezes to zero frequency at the transition temperature T-P, and the temperature dependence of the frequency is strongly affected by fluctuation effects. Diffuse x-ray scattering of the incommensurate superstructure shows a power-law scaling of the intensity and the correlation length that is compatible with an order parameter of dimension n=2

Publisher: 'American Physical Society (APS)'
Year: 2010
DOI identifier: 10.1103/PhysRevLett.102.086402
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