Abstract
Abstract The shift ΔB ov of the ESR line due to saturation of the NMR of the hyperfine coupled nuclei (Overhauser shift) was measured for single crystals of the organic conductor (FA)2PF6. ΔBov , is proportional to [Abar] tt , being the average hyperfine interaction between the conduction electrons and the protons in resonance, and the dynamic nuclear spin polarization (DNP), respectively. The DNP enhancement factor V was determined for the two orientations of the static magnetic field B o , perpendicular (V ∥ = 525 ± 40) and parallel (V ∥ = 280 ± 25) to the needle axis a, respectively. The absolute value of the average hyperfine coupling is [Abar]zz = –(1.16 ± 0.05) Gauss · ge μ B . Both, the temperature dependence and the anisotropy of the proton spin relaxation times T 1 p and T 1 p were measured from the time dependence of the Overhauser shift, ΔBov (t) after rf-pulses or after switching “on” and “off” the ESR saturation. Within the metallic phase of the crystal the proton relaxation is governed by a ...
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