Nuclear spin relaxation in the organic superconductors (BEDT-TTF)4Hg2.78Cl8 and (BEDT-TTF)4Hg2.89Br8

A. V. Skripov, A. P. Stepanov, I. Heinmaa, A. Vainrub, R. N. Lyubovskaya, M. Z. Aldoshina

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    Abstract

    The behavior of the proton spin-lattice relaxation rate T-1 1 in the organic superconductors (BEDT-TTF)4Hg2.78Cl8 (I) and (BEDT-TTF)4Hg2.89Br8 (II) is studied over the ranges of temperature 4.5≤T≤300 K and resonance frequency 33≤v≤360 MHz. At T<150 K we have found a strong frequency dependence of T-1 1 in II with a maximum between 90 and 200 MHz. This unusual frequency dependence can be explained by cross-relaxation via quadrupolar Br nuclei. The temperature dependence of T-1 1 in both I and II at low temperatures is found to be non-Korringa.

    Original languageEnglish (US)
    Pages (from-to)340-344
    Number of pages5
    JournalPhysica C: Superconductivity and its Applications
    Volume172
    Issue number3-4
    DOIs
    StatePublished - Dec 15 1990

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    ASJC Scopus subject areas

    • Condensed Matter Physics

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