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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 · · Physical Review B

Here, we use inelastic neutron scattering to study the energy and wave-vector dependence of the superconductivity-induced resonance in hole-doped Ba0.67K0.33(Fe1–xCox)2As2 (x=0 and 0.08 with Tc ≈ 37 and 28 K, respectively). In previous work on electron-doped Ba(Fe0.963Ni0.037)2As2 (TN = 26 K and Tc = 17 K), the resonance is found to peak sharply at the antiferromagnetic (AF) ordering wave vector QAF along the longitudinal direction, but disperses upwards away from QAF 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 QAF 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.

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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