Neutron Scattering Study of Low Energy Magnetic Excitation in superconducting Te-vapor annealed under-doped FeTeSe

ORAL

Abstract

To study the interplay between magnetism and superconductivity, we have performed neutron scattering measurements on a group of Te vapor annealed single crystal FeTe1-xSex (Tc\textasciitilde 11-13K) samples. The Te vapor annealed process is found to reduce/remove the excess Fe in the as-grown sample and make the under-doped originally non-superconducting sample become good superconducting sample. Our neutron scattering studies have mapped the magnetic excitation in the (HK0) plane in these compounds. A spin resonance can be observed at incommensurate wave-vectors away from (0.5,0.5). The change of low energy magnetic excitations with temperature suggests a possible phase with SC and NSC coexist on a microscopic level.

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Authors

  • zhijun xu

    • NIST Center for Neutron Research
    • University of Maryland and NIST Center for Neutron Research

  • J. A. Shneeloch

    • Brookhaven National Laboratory

  • Guangyong Xu

    • Brookhaven National Laboratory

  • Ming Yi

    • UC Berkeley

  • Yang Zhao

    • University of Maryland and NIST Center for Neutron Research

  • D. M. Pajerowski

    • Oak Ridge National Laboratory

  • Masaaki Matsuda

    • Oak Ridge National Laboratory

  • Genda Gu

    • Brookhaven National Laboratory

  • J. M. Tranquada

    • Brookhaven National Laboratory

  • R.J. Birgeneau

    • UC Berkeley

  • J. W. Lynn

    • NIST Center for Neutron Research