Dynamical Magnetism in Superconducting and Non-Superconducting 11 Iron Chalcogenides

ORAL

Abstract

There are profound connections between dynamical magnetism and unconventional superconductivity in Fe-based superconductors. Recently, new aspects associated with their multi-band, multi-orbital nature and the resulting orbital physics came to prominence in the iron chalcogenide family. Neutron scattering experiments revealed signatures of an orbital-selective electron localization and ferro-orbital order in the FeTe parent material. In the superconducting iron chalcogenide materials, the ARPES studies discovered significant temperature- and orbital-dependent correlation effects in the electronic band structure that are indicative of orbital-selective Mott physics. More recently, an orbital-selective Cooper pairing was discovered in the FeSe end member by STM. Here, we present polarized neutron scattering studies of magnetic dynamics in Fe1+yTe1-xSex samples with and without superconductivity. We analyze the evolution of the wave-vector dependence of the dynamical magnetic scattering with temperature and composition in order to understand the nature of magnetic and orbital electronic states arising from the orbital-selective correlation effects.

*This work was supported by DMSE, Office of Basic Energy Sciences, U.S. Department of Energy, under contract DE-SC0012704.

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Presenters

  • Igor Zaliznyak

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory

Authors

  • Igor Zaliznyak

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory

  • Yangmu Li

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory

  • Andrei Savici

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Vasile Garlea

    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN
    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory

  • Zhijun Xu

    • National Institute of Standards and Technology
    • NIST and University of Maryland
    • NIST Center for Neutron research, National Institute of Standards and Technology
    • NIST Center for Neutron Research
    • University of Maryland
    • NIST Center for Neutron Research, NIST

  • Genda Gu

    • Brookhaven National Laboratory
    • Brookhaven National Laboratories
    • Brookhaven national lab
    • Brookhaven National Labs
    • Condensed Matter Physics and Materials Science Department
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • CMPMS, Brookhaven National Laboratory
    • Brookhaven National Lab
    • COndensed Matter Physics and Materials Science Department, Brookhaven National Laboratory

  • John Tranquada

    • Brookhaven National Laboratory
    • Brookhaven national lab
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory