ARPES Study of Ni-Doped Fe5GeTe2 with Tc exceeding 450K

ORAL

Abstract

The vdW metallic ferromagnet Fe5GeTe2 has one of the highest Curie temperatures of any 2D ferromagnet at 270K. The Curie temperature can be further enhanced up to >450K with nickel doping of iron sites. Further doping induces a structural instability concomitant with a ferromagnetic to paramagnetic transition. Here we report the evolution of the electronic structure by ARPES measurement as a function of Ni-doping. Based on core level and valence electron photoemission, we discuss the implication of phase separation and domain pinning to the > 50% enhancement in Tc.

*This work was supported by the Yale University Startup fund. Work at Lawrence Berkeley National Laboratory was funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 within the Quantum Materials Program (KC2202).

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Presenters

  • Tyler L Werner

    • Yale University

Authors

  • Tyler L Werner

    • Yale University

  • Yu He

    • Yale university
    • Yale University
    • yale university

  • Xiang Chen

    • University of California at Berkeley
    • University of California, Berkeley
    • UC Berkeley

  • Donghui Lu

    • SLAC - Natl Accelerator Lab
    • SLAC National Accelerator Laboratory
    • SLAC National Accelerator Lab

  • Makoto Hashimoto

    • SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab
    • SLAC National Accelerator Lab

  • Elio Vescovo

    • Brookhaven National Laboratory
    • Brookhaven National Lab
    • Brookhaven National Laboratory, New York, USA

  • Turgut Yilmaz

    • Brookhaven National Laboratory

  • Robert J Birgeneau

    • University of California, Berkeley