S. Brazovskii, P. Monceau and N. Kirova
J. Phys. IV France 131 (2005) 295-298
Ultrafast optical study of the CDW phase transition in topological crystalsK. 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 (). 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.
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