Spin resonance dispersion in hole-doped $Ba_{0.67}K_{0.33}Fe_{1.84}Co_{0.16}As_2$

ORAL

Abstract

We present inelastic neutron scattering measurement in hole doped $Ba_{0.67}K_{0.33}Fe_{1.84}Co_{0.16}As_2$ where the spin resonance possesses an upward dispersion. Besides the universal enhanced signal of spin excitation at $\bm{Q_{AFM}}$ in superconducting state, a dispersive, ring-like feature along both transverse and longitudinal direction is found upon increasing energy. Our result shed some light on the origin of spin resonance as well as understanding its relationship with superconductivity in iron pnictides.

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Authors

  • Rui Zhang

    • Rice University

  • Matthew Ston

    • Oak Ridge National Laboratory

  • Thomas Maier

    • Oak Ridge National Laboratory

  • Ming Yi

    • University of California, Berkeley

  • Meng Wang

    • University of California, Berkeley

  • Pengcheng Dai

    • Rice University