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We use neutron scattering to study the electron-doped superconductingNaFe$_{0.985}$Co$_{0.015}$As ($T_c=14$ K), which has co-existing staticantiferromagnetic (AF) order ($T_N=31$ K) and exhibits two neutron spinresonances ($E_{r1}\approx 3.5$ meV and $E_{r2}\approx 6$ meV) at the in-planeAF ordering wave vector ${\bf Q}_{\rm AF}={\bf Q}_{1}=(1,0)$ in reciprocalspace. In the twinned state below the tetragonal-to-orthorhombic structuraltransition $T_s$, both resonance modes appear at ${\bf Q}_{1}$ but cannot bedistinguished from ${\bf Q}_{2}=(0,1)$. By detwinning the single crystal withuniaxial pressure along the orthorhombic $b$-axis, we find that both resonancesappear only at ${\bf Q}_{1}$ with vanishing intensity at ${\bf Q}_{2}$. Sinceelectronic bands of the orbital $d_{xz}$ and $d_{yz}$ characters split below$T_s$ with the $d_{xz}$ band sinking $\sim10$ meV below the Fermi surface, ourresults indicate that the neutron spin resonances inNaFe$_{0.985}$Co$_{0.015}$As arise mostly from quasi-particle excitationsbetween the hole and electron Fermi surfaces with the $d_{yz}$ orbitalcharacter.

Orbital selective neutron spin resonance in underdoped superconducting NaFe$_\textbf{0.985}$Co$_\textbf{0.015}$As