Abstract
The behavior of the proton spin-lattice relaxation rate T −1 1 in the organic superconductors (BEDT-TTF) 4Hg 2.78Cl 8 (I) and (BEDT-TTF) 4Hg 2.89Br 8 (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.
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