J. Phys. IV France
Volume 131, December 2005
Page(s) 295 - 298
Publié en ligne 18 janvier 2006
International Workshop on Electronic Crystals
S. Brazovskii, P. Monceau and N. Kirova
J. Phys. IV France 131 (2005) 295-298

DOI: 10.1051/jp4:2005131075

Ultrafast optical study of the CDW phase transition in topological crystals

K. Shimatake1, Y. Toda1, 2, T. Minami1 and S. Tanda1

1  Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan
2  PRESTO Japan Science and Technology Agency, Saitama 332-0012, Japan

Influence of the crystal topology on the Peierls transition was investigated by means of ultrafast optical pump-probe measurements. The comparison of the exponential single particle decay between the whisker and ring NbSe3 compounds reveals several pronounced differences around a phase transition temperature (${\rm T}_P$). A discrepancy from BCS-like temperature dependence of the gap was observed in the ring, suggesting a loss of phase coherence between adjacent chains in the closed-loop topology.

© EDP Sciences 2005