Quantum Hall effect and edge states in (TMTSF)(2)PF6

Study of high quality (TMTSF)(2)PF6 crystals reveals that the quantum Hall effect seen in the field-induced spin density wave states is accompanied by nearly vanishing longitudinal magnetoresistance. Motivated by these findin gs, we examine whether there are current carrying edge states associated wi th the quantum Hall effect in the (TMTSF)(2)X Bechgaard salts. Measurements of in-plane and out-plane resistivities, R-xx and R-zz, and 2 and 4-termin al resistance suggest that the transport in the Bechgaard salts is dominate d by the bulk and that it is difficult to separate the contribution from th e edge states.