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

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.


Published in:
Physical Review Letters, 102, -
Year:
2009
Keywords:
Laboratories:




 Record created 2010-11-30, last modified 2018-09-13


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