| Issue |
J. Phys. IV France
Volume 131, December 2005
|
|
|---|---|---|
| Page(s) | 357 - 358 | |
| DOI | https://doi.org/10.1051/jp4:2005131092 | |
| Published online | 18 January 2006 | |
J. Phys. IV France 131 (2005) 357-358
DOI: 10.1051/jp4:2005131092
NMR evidence of hidden order in the high-temperature phase of (TaSe4)2I
L. Németh1, G. Kriza1, P. Matus1 and B. Alavi21 Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, PO Box 49, 1525 Budapest, Hungary
2 Department of Physics and Astronomy, UCLA, Los Angeles, California 90095-1547, USA
Abstract
(TaSe4)2 I has a quasi-one-dimensional electronic structure with
charge-density wave (CDW) ground state forming in a phase transition
at TP = 265 K. Here we report on 77Se nuclear
magnetic resonance (NMR) spectrum and spin-spin relaxation time
(T2) measurements in the temperature range of 100 to 380 K. The
line positions are shown to couple to the CDW order parameter. The
spin-spin relaxation rate displays a sharp minimum at TP; signs
of critical slowing down are absent. Together with the fast increase
of the order parameter, these findings are consistent with a true
gap due to hidden order in the high-temperature phase.
© EDP Sciences 2005