Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2

Zhang, Rui N.; Wang, Weiyi; Maier, Thomas A.; Wang, Meng; Stone, Matthew B.; Chi, Songxue; Winn, Barry L.; Dai, Pengcheng

doi:10.1103/PhysRevB.98.060502

Title: Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in ${Ba}_{0.67} K_{0.33} {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$

Journal Article · 29 August 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.98.060502 · OSTI ID:1468036

Zhang, Rui N. ^[1]; Wang, Weiyi ^[1];

^[2]; Wang, Meng ^[3];

^[2];

^[2]; Dai, Pengcheng ^[1]

Rice Univ., Houston, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sun Yat-Sen Univ., Guangzhou (China)

Here, we use inelastic neutron scattering to study the energy and wave-vector dependence of the superconductivity-induced resonance in hole-doped Ba_0.67K_0.33(Fe_1–xCo_x)₂As₂ (x=0 and 0.08 with T_c ≈ 37 and 28 K, respectively). In previous work on electron-doped Ba(Fe_0.963Ni_0.037)₂As₂ (T_N = 26 K and T_c = 17 K), the resonance is found to peak sharply at the antiferromagnetic (AF) ordering wave vector Q_AF along the longitudinal direction, but disperses upwards away from Q_AF along the transverse direction. For hole-doped x = 0 and 0.08 without AF order, we find that the resonance displays a ringlike upward dispersion away from Q_AF along both the longitudinal and transverse directions. By comparing these results with calculations using the random phase approximation, we conclude that the dispersive resonance is a direct signature of isotropic superconducting gaps arising from nested hole-electron Fermi surfaces.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1468036

Alternate ID(s):: OSTI ID: 1467958

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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