SDW transition of quenched (TMTSF)(2)ClO4 at high magnetic fields

The magnetic field dependence of the SDW transition (T-SDW) in quenched (TM TSF)(2)ClO4 has been measured up to 27 T, with the field parallel to the c* -direction. T-SDW increases from 4.5 K in zero held up to 8.4 K at 27 T. Th e field dependence of T-SDW has been calculated in the framework of the mea n-field theory. As predicted, a quadratic behavior is observed at low field , followed by a saturation behavior. T-SDW corresponding to the perfect nes ting case is estimated to be 13.5 K. This means that the SDW phase of quenc hed (TMTSF)(2) ClO4 is strongly suppressed by the two dimensionality of the system. (C) 2000 Elsevier Science B.V. All rights reserved.