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  • Low frequency dielectric spectroscopy of the Peierls-Mott insulating state in the deuterated copper-DCNQI systems
    Pinterić, Marko ...
    We report a detailed characterization of an unique 3-fold commensurate insulating state in single crystals of the organic ▫$\pi$▫ - 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 ▫$\Delta\epsilon\approx 10^3-10^4$▫ centred at ▫$\nu_0\approx 1-10$▫ 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 (▫$\tau_0$▫=1/2▫$\pi\nu_0$▫) 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.
    Source: The European physical journal. B, Condensed matter physics. - ISSN 1434-6028 (16, 2000, str. 487-493)
    Type of material - article, component part
    Publish date - 2000
    Language - english
    COBISS.SI-ID - 5691926

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