Magnetic field dependence of spin fluctuations in superconducting FeSe0.4Te0.6

ORAL

Abstract

Spin fluctuations may play a key role in metals where superconductivity appears as a magnetic phase is suppressed under pressure or with chemical substitution. The suppressed magnetism is manifested as a gap in the spin fluctuation spectrum and a spin resonance to which the spectral weight is shifted. We have studied the effect of high magnetic fields on this resonance. While fine structure is observed, these features do not shift with field and persist in zero field and in the normal state. Temperature difference spectra are however, significantly broadened in high fields.

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Authors

  • V. Thampy

    Institute of Quantum Matter, Dept. of Physics, Johns Hopkins Univ

  • Yang Zhao

    NIST Center for Neutron Reseach, NIST Center for Neutron Research

  • W. Bao

    Dept. of Physics, Renmin Univ. of China

  • Zhiqiang Mao

    Dept. of Physics, Tulane Univ., Department of Physics, Tulane University, Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, Department of Physics and Engineering Physics, Tulane University, New Orleans, Department of Physics and Engineering Physics, Tulane University

  • J. Rodriguez

    NIST Center for Neutron Research, NIST Center for Neutron Reseach, NCNR, NIST, USA

  • D. Argyriou

    Helmholtz-Zentrum Berlin f\"ur Materialen und Energy, Germany

  • A. Savici

    Oak Ridge National Lab

  • G. Granroth

    Oak Ridge National Lab

  • A. Hiess

    Institut Max von Laue-Paul Langevin, France

  • C. Broholm

    Institute of Quantum Matter, Dept. of Physics, Johns Hopkins Univ, IQM, Johns Hopkins Univ, USA, Johns Hopkins University