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

Study of high quality (TMTSF)2PF6 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 findings, we examine whether there are current carrying edge states associated with the quantum Hall effect in the (TMTSF)2X Bechgaard salts. Measurements of in-plane and out-plane resistivities, Rxx and Rzz, and 2 and 4-terminal resistance suggest that the transport in the Bechgaard salts is dominated by the bulk and that it is difficult to separate the contribution from the edge states.