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The Mott insulator \kappa-(BEDT-TTF)2Cu[N(CN)2]Cl consists of moleculardimers arranged on an anisotropic triangular lattice and develops a cantedantiferromagnetic ground state. It has recently been suggested that this systemfeatures purely electronic ferroelectricity which requires an electric dipolemoment. Optical spectroscopy clearly rules out charge imbalance in this system,which excludes the existence of quantum electric dipoles on the dimers andsubsequently a dipolar spin coupling. We suggest that the prominent in-planedielectric response in \kappa-(BEDT-TTF)2Cu[N(CN)2]Cl is due to short-rangediscommensurations of the antiferromagnetic phase in the temperature range 30 <T < 50 K, and domain wall relaxations at lower temperatures.

Search for quantum electronic dipoles in the dimerized \kappa-(BEDT-TTF)2Cu[N(CN)2]Cl salt