High field Hall effect in (DMET-TSeF)(2)AuCl2

The Hall effect of the quasi one-dimensional system (DMET-TSeF)(2)AuCl2 is reported at high fields where the system is in the FISDW (Field Induced Spi n Density Wave) state. The Hall voltage shows similar but different behavio r to those observed in the famous TMTSF system. The Hall voltages show step like behavior, but they are nor clearly quantized, The voltage disappears above 18 T, and not the inverses of the FISDW boundary fields but the squar es of them seem to show linear dependence to the phase indices n. The absol ute values of the Hall voltages at the corresponding phase indices are abou t one tenth of the values observed in TMTSF system. Moving FISDW states hav e been proposed to understand the differences.