ANION-ORDERING EFFECTS IN THE NONCENTROSYMMETRIC ANION SALT (TMTSF)(2)CLO4 IN MAGNETIC-FIELDS

We have studied the effect of anion disordering by thermal quenching i n a non-centrosymmetric anion salt, (TMTSF)(2)ClO4, under magnetic fie lds. In the zero-field spin-density wave phase obtained by high therma l quenching, evidence for the existence of two different phases was fo und. We also obtain the exponential dependence of the spin-density wav e temperature, T-SDW on the cooling rate Q as well as the dependence o f T-SDW on the magnetic field.