2001/09/30 by T. Vuletic, Tomislav Vuletić, P. Auban-Senzier +9 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Molecular Junctions and Nanostructures #Organic and Molecular Conductors Research #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1140/epjb/e20020037
published as Eur. Phys. J. B 25, 319-331 (2002) · 13 pages, 10 figures, revised v: fig.9 added, section 4.2 rewritten, accepted v: sections 4&5 improved
openalex publication_date 2002/02/01 · arxiv created 2002/02/25 · arxiv updated 2009/11/30 · openalex created_date 2020/11/23 · openalex updated_date 2026/07/28
The phase diagram of the organic superconductor (TMTSF)2PF6 has 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 TSDW and TSC and the superconducting critical current. The onset temperature TSC is practically constant (1.20+-0.01 K) in this region where only the SC/SDW domain proportion below TSC is increasing under pressure. An homogeneous superconducting state is recovered above the critical pressure with TSC 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.