Unconventional multiband superconductivity with nodes in   single-crystalline SrFe2(As_0.65P_0.35)2 as seen via 31P-NMR and specific   heat
  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. 
T. Dulguun, H. Mukuda, T. Kobayashi, F. Engetsu, H. Kinouchi, M.   Yashima, Y. Kitaoka, S. Miyasaka, and S. Tajima
cond-mat.supr-con