J. Phys. IV France
Volume 12, Numéro 9, November 2002
Page(s) 177 - 178

J. Phys. IV France
12 (2002) Pr9-177
DOI: 10.1051/jp4:20020388

Increase of the charge density wave phase coherence in the sliding and the mode-locked state

R. Danneau1, 2, A. Ayari1, D. Rideau1, 2, H. Requardt3, J.E. Lorenzo4, L. Ortega4, P. Monceau1, 5, R. Currat2 and G. Grübel3

1  Centre de Recherches sur les Tres Basses Temperatures, CNRS, BP. 166,38042 Grenoble, France
2  Institut Laue-Langevin, BP. 156, 38042 Grenoble, France
3  European Synchrotron Radiation Facility, BP. 220, 38043 Grenoble, France
4  Laboratoire de Cristallographie, CNRS, BP. 166, 38042 Grenoble, France
5  Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette cedex, France

Using high-resolution x-ray techniques coupled to in situ electrical measurements, we have measured the spatial coherence of the charge density waves (CDW) in the sliding state without and with a rf field. In the first case, at T = 100 K , we find that the CDW becomes more ordered in the direction of the motion, while the transverse correlation is reduced. With the application of a rf field in the mode locked state, we find that the longitudinal correlation length is even larger.

© EDP Sciences 2002