From spin-Peierls to superconductivity: (TMTTF)_2PF_6 under high pressure

Details From spin-Peierls to superconductivity: (TMTTF)_2PF_6 under high pressure From spin-Peierls to superconductivity: (TMTTF)_2PF_6 under high pressure

2000-05-23

arxiv.org/abs/cond-mat/0005378v1

J. Phys.: Condens. Matter 13 (2001) L89-L95

Physics

Condensed Matter

Superconductivity

4 pages, revtex, 4 figures (jpeg,eps,png)

Scientific paper

10.1088/0953-8984/13/4/104

The nature of the attractive electron-electron interaction, leading to the formation of Cooper-pairs in unconventional superconductors has still to be fully understood and is subject to intensive research. Here we show that the sequence spin-Peierls, antiferromagnetism, superconductivity observed in (TMTTF)_2PF_6 under pressure makes the (TM)_2X phase diagram universal. We argue that the suppression of the spin-Peierls transition under pressure, the close vicinity of antiferromagnetic and superconducting phases at high pressure as well as the existence of critical antiferromagnetic fluctuations above T_c strongly support the intriguing possibility that the interchain exchange of antiferromagnetic fluctuations provides the pairing mechanism required for bound charge carriers.

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