Measurement of a Double Neutron-Spin Resonance and an Anisotropic Energy Gap for Underdoped Superconducting NaFe0.985Co0.015As Using Inelastic Neutron ScatteringRemoveChenglin Zhang, Rong Yu, Yixi Su, Yu Song, Miaoyin Wang, Guotai Tan, Takeshi Egami, J. A. Fernandez-Baca, Enrico Faulhaber, Qimiao Si, and Pengcheng DaiPhys. Rev. Lett. 111, 207002 (2013)
