Giant Kohn anomaly and the phase transition in charge density wave ZrTe_3

Details Giant Kohn anomaly and the phase transition in charge density wave ZrTe_3 Giant Kohn anomaly and the phase transition in charge density wave ZrTe_3

2009-02-05

arxiv.org/abs/0902.0867v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures. accepted at Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.102.086402

A strong Kohn anomaly in ZrTe_3 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.

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