Low-frequency dielectric response of charge-density wave pinned by commensurability in (2,5(OCH3)2DCNQI)2Li
Institute of Physics - P.O.Box 304, HR-10000 Zagreb, Croatia
2 Physikalisches Institut, Universität Stuttgart - D-70550 Stuttgart, Germany
3 Laboratoire de Physique des Solides, Université Paris-Sud - 91405 Orsay, France
Accepted: 15 March 1997
We have used complex conductivity measurements between 20 Hz and 1 MHz to probe the dielectric response in the low-temperature phase of the organic conductor. The observed data reveal the existence of the relaxation process which is well described by a Debye-like expression for an overdamped response of a system with a single degree of freedom. Both the static dielectric constant () and the characteristic relaxation time () are much larger than that expected for single-particle excitations. is thermally activated in a manner similar to the dc conductivity. We attribute the observed relaxation to N=4 charge density wave pinned by commensurability to the underlying lattice.
PACS: 71.45.Lr – Charge-density-wave systems / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors)
© EDP Sciences, 1997