Recent experiments give compelling evidence that superconductivity in Bechgaard salts involves spin-triplet Cooper pairing. The proximity of triplet superconductivity and antiferromagnetism in these compounds prompts us to study the interplay between the two orders in quasi-one dimensional electron systems. We find that the two orders are unified in a natural way through an SO(4) symmetry group, and we show that SO(4) is a good approximate symmetry of the system near the phase transition between the two orders, without the need for fine-tuning of microscopic parameters. In this chapter we study the experimental consequences of SO(4) symmetry, including predictions for the phase diagram and for the low-energy excitation spectrum of Bechgaard salts.
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Podolsky, D., Altman, E., Demler, E. (2008). SO(4) Symmetry in Bechgaard Salts. In: Lebed, A. (eds) The Physics of Organic Superconductors and Conductors. Springer Series in Materials Science, vol 110. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-76672-8_26
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