Abstract
The effects of different linear trihalide anions on electron spin resonance (ESR) spectra have been studied for single crystals of four BEDT-TTF salts plus one crystal containing mixed anions. Structural disorder is reflected in an increased low-temperature (residual) ESR linewidth for both ß-(BEDT-TTF) 2I 3 and ß-(BEDT-TTF) 2I 2Br and for (nominally!) ß-(BEDT_TTF) 2 (AuI 2) 0.82(I 3) 0.18 Suppression of the disorder transition in ß-(BEDT-TTF) 2I 3 by application of shear stress to form the ß ∗- phase decreases the residual linewidth while increasing the onset of superconductivity from 1.5 to ≈8 K. Anion size (or equivalently unit cell size) has been shown to correlate with the superconducting transition temperature in these isomorphic salts, but we find no correlation between anion size and the ESR spin susceptibility, linewidth or microwave conductivity.
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