New Molecular Charge Transfer Salts of BEDT-TTF, Bis(ethylenedithio) Tetrathiafulvalene, with ThiocyanatoComplex Anions: (BEDT-TTF)4[Fe(NCS)6]·CH2Cl2 and (BEDT-TTF)2[Cr(NCS)4(bipym)]·0.15H2O

The linear and nonlinear magnetic responses of the molecular-based magnet Co3BTCA2(H2O)4 have been studied as a function of frequency and temperature. The out-of-phase component of the linear susceptibility and the nonlinear susceptibilities all show maxima at the critical temperature of 23 K while displaying a novel resonance in their frequency dependence. The existence of the resonance in the out-of-phase component demonstrates the absence of dynamic scaling in this magnetic system.