Abstract
The magnetic field dependence of the SDW transition in (TMTSF) 2 ClO 4 for various anion quenching rates has been measured up to 27T , with the field parallel to the lowest conductivity direction c * . The SDW transition temperature T SDW decreases with decreasing quenching rate and the rate of increase with magnetic field increases with decreasing T SDw . For quenched (TMTSF) 2 ClO 4 , T SDW increases from 4.5K in zero field up to 8.4K at 27T. As predicted, a quadratic behavior is observed below 18T, followed by a saturation behavior. These results are consistent with the prediction of the mean-field theory. For the perfect nesting case, T SDW is estimated as T SDWo =13.5K. This means that the SDW phase of quenched (TMTSF) 2 Cl0 4 is strongly suppressed by the two-dimensionality of the system. In the intermediate cooling state in which there is no SDW phase in zero field, T SDW shows a quadratic behavior above 12T and there is no saturation even at 27T, which is different to the field induced SDW phase of the relaxed state. This may be attributed to the difference of the anion gap structure.
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