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

Abstract

We use neutron scattering to study the electron-doped superconducting NaFe${}_{0.985}$Co${}_{0.015}$As ($T_c=14$ K), which has co-existing static antiferromagnetic (AF) order ($T_N=31$ K) and exhibits two neutron spin resonances ($E_{r1}\approx 3.5$ meV and $E_{r2}\approx 6$ meV) at the in-plane AF ordering wave vector ${\mathbf{Q}}_{\mathrm{AF}}={\mathbf{Q}}_1=(1,0)$ in reciprocal space. In the twinned state below the tetragonal-to-orthorhombic structural transition $T_s$, both resonance modes appear at ${\mathbf{Q}}_1$ but cannot be distinguished from ${\mathbf{Q}}_2=(0,1)$. By detwinning the single crystal with uniaxial pressure along the orthorhombic $b$-axis, we find that both resonances appear only at ${\mathbf{Q}}_1$ with vanishing intensity at ${\mathbf{Q}}_2$. Since electronic bands of the orbital $d_{xz}$ and $d_{yz}$ characters split below $T_s$ with the $d_{xz}$ band sinking $\sim 10$ meV below the Fermi surface, our results indicate that the neutron spin resonances in NaFe${}_{0.985}$Co${}_{0.015}$As arise mostly from quasi-particle excitations between the hole and electron Fermi surfaces with the $d_{yz}$ orbital character.

5 pages, 4 figures, accepted by Phys. Rev. B

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Cited by in corpus (3)

• The three-dimensional electronic structure of the nematic and antiferromagnetic phases of NaFeAs from detwinned ARPES measurements
• Orbital-selective spin waves in detwinned NaFeAs
• Spin fluctuation anisotropy as a probe of orbital-selective hole-electron quasiparticle excitations in detwinned Ba(Fe1-xCox)2As2