The magnetic field dependence of the SDW transition in (TMTSF)2ClO4 for various anion cooling rates has been measured, with the field up to 27 T parallel to the lowest conductivity direction c*. For quenched (TMTSF)2ClO4, the SDW transition temperature TSDW increases from 4.5 K in zero field up to 8.4 K at 27 T. A quadratic behavior is observed below 18 T, followed by a saturation behavior. These results are consistent with the prediction of the mean-field theory. From these behaviors, TSDW is estimated as TSDW0 = 13.5 K for the perfect nesting case. This indicates that the SDW phase in quenched (TMTSF)2ClO4, where TSDW is less than 6 K, is strongly suppressed by the two-dimensionality of the system. In the intermediate cooled state in which the SDW phase does not appear in zero field, the transition temperature for the field-induced SDW shows a quadratic behavior above 12 T and there is no saturation behavior even at 27 T, in contrast to the FISDW phase in the relaxed state. This behavior can probably be attributed to the difference of the dimerized gap due to anion ordering.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2000 Oct 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics