Abstract
Among many Bechgaard salts, , where TMTSF denotes tetramethyltetraselenafulvalene, exhibits very anomalous low-temperature properties. Unlike the case of the conventional spin-density wave (SDW), undergoes the SDW transition at and the low-temperature quasiparticle excitations are gapless. Also, it is known that does not exhibit superconductivity even under pressure, while a field-induced SDW is found in only for and . Here we show that both the angle-dependent magnetoresistance data and the nonlinear Hall resistance of at ambient pressure are interpreted satisfactorily in terms of an unconventional spin-density wave. Based on these facts, we propose a new phase diagram for Bechgaard salts.
- Received 3 October 2006
DOI:https://doi.org/10.1103/PhysRevB.75.052409
©2007 American Physical Society