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We performed inelastic neutron scattering on powder sample of the P-dopediron-based superconductor BaFe2(As0.65P0.35)2 with Tc = 30K, whosesuperconducting (SC) order parameter is expected to have line nodes. We haveobserved spin resonance at Q $\sim$ 1.2{\AA}^{-1} and E=12 meV in the SC state.The resonance enhancement, which can be a measure of the area of sign reversalbetween the hole and electron Fermi surfaces (FSs), is comparable to those ofother iron-based superconductors without line nodes. This fact indicates thatthe sign reversal between the FSs is still dominant in this system, and theline nodes should create only limited area of sign-reversal on a single FS.Hence the system can hold relatively high-Tc. Comparison with theoreticalcalculation indicates horizontal line nodes may be a candidate to reproduce theobservation.

Strong spin resonance on BaFe2(As0.65P0.35)2 with Tc = 30 K