Polarized Neutron Spectroscopy of Dynamical Magnetism in Parent and Superconducting Fe(Te,Se)

ORAL

Abstract

Inelastic neutron scattering presented perhaps the first experimental indication of the orbital-selective electron localization in the Fe chalcogenides [1]. The follow-up study [2] established the concomitant ferro-orbital order, leading to the "bicollinear" antiferromagnetism, a metallic state, and a loss of magnetic susceptibility[1,2]. Here, we present polarized inelastic neutron surveys of the temperature-dependent magnetic dynamics in both Fe1+yTe, and the optimally doped superconductor, FeTe0.55Se0.45. We observe that the local dynamical correlations in the superconducting sample in the energy range of the spin resonance, at high temperature become similar to those found in the under-doped samples [1], and which are also observed in the optimally doped samples at higher energy. Our results reveal unusual, energy- and temperature-dependent orbital composition of dynamical magnetism in these materials.
[1] I. A. Zaliznyak, et. al., Phys. Rev. Lett. 107, 216403 (2011).
[2] D. Fobes, et. al., Phys. Rev. Lett. 112, 187202 (2014).
[3] I. Zaliznyak, et. al., Proc Natl Acad Sci USA, 112(33), 10316-10320 (2015).

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Presenters

  • Igor Zaliznyak

    Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Brookhaven National Laboratory, Brookhaven Natl Lab

Authors

  • Igor Zaliznyak

    Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Brookhaven National Laboratory, Brookhaven Natl Lab

  • Andrei Savici

    Neutron Data Analysis and Visualization Division, Oak Ridge National Laboratory

  • Vasile Garlea

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge National Lab

  • Zhijun Xu

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

  • Guangyong Xu

    NCNR, National Institute of Standards and Technology, NIST Center for Neutron Research, National Institute of Standards and Technology, NIST -Natl Inst of Stds & Tech, NIST Center for Neutron Research, NIST

  • Genda Gu

    Brookhaven National Laboratory, Brookhaven National Labs, Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Condensed Matter &materials Science, Brookhaven Natl Lab, Brookhaven Natl Lab, Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Brookhaven Natl. Lab, Brookhaven National Lab, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, brookhaven national laboratory

  • John Tranquada

    Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Brookhaven National Laboratory, Condensed Matter &materials Science, Brookhaven Natl Lab, Brookhaven Natl Lab, Brookhaven Natl. Lab