Abstract.
We report a detailed characterization of an unique 3-fold commensurate insulating state in single crystals of the organic π – inorganic d hybrid Cu(DMe-DCNQI)2 systems with deuterated and partially deuterated DCNQI ring, by means of low-frequency dielectric spectroscopy. A broad relaxation mode of strength ∆ε ≈ 103-104 centred at ν0 ≈ 1-10 kHz is observed in the hysteresis temperature region in which the insulating phase coexists with metallic islands. At lower temperatures, outside the nucleation range, the relaxation narrows, approaching a Debye-like form for an overdamped response of a system with a single degree of freedom. Both, the relaxation strength and the mean relaxation time (T0= 1/2πν0) are much larger than that expected for single-particle excitations. These features suggest the origin of the dielectric relaxation as an intrinsic property of the N = 3 charge density wave state.
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Received 1 December 1999 and Received in final form 5 April 2000
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Pinterić, M., Vuletić, T., Lončarić, M. et al. Low frequency dielectric spectroscopy of the Peierls-Mott insulating state in the deuterated copper-DCNQI systems. Eur. Phys. J. B 16, 487–493 (2000). https://doi.org/10.1007/s100510070207
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DOI: https://doi.org/10.1007/s100510070207