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

Abstract

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.

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

References in corpus (1)

• Effects of Spin Fluctuations in Quasi-One-Dimensional Organic Superconductors

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• High pressure x-ray study of spin-Peierls physics in the quantum spin chain material TiOCl
• Competition between Triplet Superconductivity and Antiferromagnetism in Quasi One-Dimensional Electron Systems
• Combined X-ray diffraction, electrical resistivity, and $ab$ $initio$ study of (TMTTF)${}_2$PF${}_6$ under pressure: implications to the unified phase diagram