APS Logo

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.

–

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