Physics – Condensed Matter – Superconductivity
Scientific paper
2011-08-23
Physics
Condensed Matter
Superconductivity
6 pages, 5 figures, 1 table
Scientific paper
We report 31P-NMR and specific heat measurements on an iron (Fe)-based superconductor SrFe2(As0.65P0.35)2 with Tc=26 K, which have revealed the development of antiferromagnetic correlations in the normal state and the unconventional superconductivity(SC) with nodal gap dominated by the gapless low-lying quasiparticle excitations. The results are consistently argued with an unconventional multiband SC state with the gap-size ratio of different bands being significantly large; the large full gaps in s\pm-wave state keep Tc high, whereas a small gap with a nodal-structure causes gapless feature under magnetic field. The present results will develop an insight into the strong material dependence of SC-gap structure in Fe-based superconductors.
Dulguun T.
Engetsu F.
Kinouchi Hiroaki
Kitaoka Yoshio
Kobayashi Tatsuo
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