ISSN:
1434-6036
Keywords:
PACS. 71.10.Ay Fermi-liquid theory and other phenomenological models – 74.25.Dw Superconductivity phase diagrams – 74.70.Kn Organic superconductors – 75.30.Fv Spin-density waves
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1140/epjb/e20020037
Permalink
