4 research outputs found
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.Comment: 6 pages, 5 figures, 1 tabl