Abstract:
The phase diagram of the organic superconductor (TMTSF)2PF6has been revisited using transport measurements with an improved control of the applied pressure. We have found a 0.8 kbar wide pressure domain below the critical point (9.43 kbar, 1.2 K) for the stabilisation of the superconducting ground state featuring a coexistence regime between spin density wave (SDW) and superconductivity (SC). The inhomogeneous character of the said pressure domain is supported by the analysis of the resistivity between T SDW and T SC and the superconducting critical current. The onset temperature T SC is practically constant ( 1.20±0.01 K) in this region where only the SC/SDW domain proportion below T SC is increasing under pressure. An homogeneous superconducting state is recovered above the critical pressure with T SC falling at increasing pressure. We propose a model comparing the free energy of a phase exhibiting a segregation between SDW and SC domains and the free energy of homogeneous phases which explains fairly well our experimental findings.
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Received 3 September 2001 and Received in final form 9 November 2001
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Vuletić, T., Auban-Senzier, P., Pasquier, C. et al. Coexistence of superconductivity and spin density wave orderings in the organic superconductor (TMTSF) 2 PF 6 . Eur. Phys. J. B 25, 319–331 (2002). https://doi.org/10.1140/epjb/e20020037
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DOI: https://doi.org/10.1140/epjb/e20020037