Neutron spin resonance as a probe of superconducting gap anisotropy in partially detwinned electron underdoped NaFe${}_{0.985}$Co${}_{0.015}$As

Abstract

We use inelastic neutron scattering (INS) to study the spin excitations in partially detwinned NaFe${}_{0.985}$Co${}_{0.015}$As which has coexisting static antiferromagnetic (AF) order and superconductivity ($T_c=15$ K, $T_N=30$ K). In previous INS work on a twinned sample, spin excitations form a dispersive sharp resonance near $E_{r1}=3.25$ meV and a broad dispersionless mode at $E_{r1}=6$ meV at the AF ordering wave vector ${\mathbf{Q}}_{\mathrm{AF}}={\mathbf{Q}}_1=(1,0)$ and its twinned domain ${\mathbf{Q}}_2=(0,1)$. For partially detwinned NaFe${}_{0.985}$Co${}_{0.015}$As with the static AF order mostly occurring at ${\mathbf{Q}}_{\mathrm{AF}}=(1,0)$, we still find a double resonance at both wave vectors with similar intensity. Since ${\mathbf{Q}}_1=(1,0)$ characterizes the explicit breaking of the spin rotational symmetry associated with the AF order, these results indicate that the double resonance cannot be due to the static and fluctuating AF orders, but originate from the superconducting gap anisotropy.

arXiv comment5 pages, 5 figures; PRB, 2015 (the correct final version is now used)

References in corpus (34)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• A Common Thread: the pairing interaction for the unconventional superconductors
• Gap symmetry and structure of Fe-based superconductors
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Normal-State Spin Dynamics and Temperature-Dependent Spin Resonance Energy in an Optimally Doped Iron Arsenide Superconductor
• The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
• Theory of magnetic excitations in iron-based layered superconductors
• Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
• Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2
• Three-dimensional Resonance in superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Unconventional superconducting gap in NaFe${}_{0.95}$Co${}_{0.05}$As observed by angle-resolved photoemission spectroscopy
• Superconductivity, Antiferromagnetism, and Neutron Scattering
• Orbital-selective superconductivity, gap anisotropy and spin resonance excitations in a multiorbital t-J1-J2 model for iron pnictides
• Splitting of resonance excitations in nearly optimally doped Ba(Fe0.94Co0.06)2As2: an inelastic neutron scattering study with polarization analysis
• Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1-xCoxAs
• Short-range cluster spin glass near optimal superconductivity in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Distinguishing $s^{\pm }$ and $s^{++}$ electron pairing symmetries by neutron spin resonance in superconducting NaFe${}_{0.935}$Co${}_{0.045}$As
• Anisotropic but nodeless superconducting gap in the presence of spin density wave in iron-pnictide superconductor NaFe1-xCoxAs
• Muon spin rotation study of magnetism and superconductivity in Ba(Fe1-xCox)2As2 single crystals
• Superconductivity in Multi-orbital t-J1-J2 Model and its Implications for Iron Pnictides
• Uniaxial pressure effect on structural and magnetic phase transitions in NaFeAs and its comparison with as-grown and annealed BaFe${}_2$As${}_2$
• Strong-Coupling Superconductivity in NaFe${}_{1-x}$Co${}_x$As: the Eliashberg Theory and Beyond
• Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs
• Magnetic anisotropy in hole-doped superconducting Ba 0.67K 0.33Fe 2As2 probed by polarized inelastic neutron scattering
• Anisotropy of incommensurate magnetic excitations in slightly overdoped Ba${}_{0.5}$K${}_{0.5}$Fe${}_2$As${}_2$ probed by polarized inelastic neutron scattering experiments
• Magnonlike dispersion of spin resonance in Ni-doped BaFe${}_2$As${}_2$
• Magnetic resonance from the interplay of frustration and superconductivity
• A weak-coupling superconductivity in the electron doped NaFe${}_{0.95}$Co${}_{0.05}$As is revealed by ARPES
• Double magnetic resonance and spin anisotropy in Fe-based superconductors due to static and fluctuating antiferromagnetic orders
• Phase Separation, Competition, and Volume Fraction Control in NaFe${}_{1-x}$Co${}_x$As
• Microscopic coexistence of a two-component incommensurate spin density wave with superconductivity in underdoped NaFe${}_{0.983}$Co${}_{0.017}$As

Cited by in corpus (6)

• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Electron doping evolution of the neutron spin resonance in NaFe${}_{1-x}$Co${}_x$As
• Experimental elucidation of the origin of the `double spin resonances' in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe${}_{1-x}$Se${}_x$ with $x\le 0.2$
• Orbital selective neutron spin resonance in underdoped superconducting NaFe${}_{\text{0.985}}$Co${}_{\text{0.015}}$As