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.

*Work at JHU supported by DoE through DE-FG02-08ER46544.

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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