Naslov
Coexistence of Superconductivity and Spin Density Wave orderings in the organic superconductor (TMTSF)2PF6

Autori
Vuletić, Tomislav ; Auban-Senzier, Pascale ; Pasquier, Claude ; Tomić, Silvia ; Jérome, Denis ; Héritier, Michel ; Bechgaard, Klaus

Izvornik
European Physical Journal B (1434-6028) 25 (2002); 319-331

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Superconductivity phase diagrams; Organic superconductors; Spin-density waves; Fermi-liquid theory and other phenomenological models

Sažetak
The phase diagram of the organic superconductor (TMTSF)_2PF_6 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 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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