Spontaneous Nernst effect in the iron-based superconductor Fe<sub>1+y</sub>Te<sub>1-x</sub>Se<sub>x</sub>

ORAL

Abstract

We present a study of the Nernst effect in an iron-based superconductor with a nontrivial band topology Fe1+yTe1-xSex . A nonzero Nernst signal is observed in a narrow temperature region around the superconducting transition temperature Tc at a zero field. This anomalous Nernst signal shows symmetric dependence on the external magnetic field and indicates an unconventional vortex contribution in an s-wave superconductor with a strong spin-orbit coupling, which is originated from the local magnetic moments of the interstitial Fe atoms. Our experiments also provide the first evidence of a locally broken time-reversal symmetry in bulk Fe1+yTe1-xSex single crystals.

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Presenters

  • Lu Chen

    • University of Michigan

Authors

  • Lu Chen

    • University of Michigan

  • Ziji Xiang

    • University of Michigan

  • Colin B Tinsman

    • University of Michigan

  • Bin Lei

    • Physics, University of Science and Technology of China,

  • Xianhui Chen

    • Physics, University of Science and Technology of China,
    • University of Science and Technology of China

  • 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

  • Lu Li

    • University of Michigan