Cr<sub>0.5</sub>Ga<sub>0.5</sub>Te<sub>2</sub>: A near-room temperature semiconducting 2D van der Waals ferromagnet

Oral-In-person

Abstract

The discovery of two-dimensional (2D) van der Waals ferromagnet has revitalized interest in low-dimensional magnetism. Here, we report the synthesis and comprehensive physical-property characterization of the layered and exfoliable ferromagnetic semiconductor Cr0.5Ga0.5Te2. This compound crystallizes in the trigonal space group P3, featuring Te vacancies in two sites. It exhibits ferromagnetic ordering below 216 K, with a saturated moment of 4.6 µB/Cr at 1.8 K and pronounced magnetic anisotropy, with easy axis along the crystallographic c-direction. We further demonstrate that Cr0.5Ga0.5Te2 can be exfoliated down to the monolayer limit. The compound is a narrow gap (~100 meV) magnetic semiconductor in bulk. The combination of its semiconducting nature, near-room-temperature ferromagnetism and excellent exfoliability establishes Cr0.5Ga0.5Te2 as a compelling new 2D van der Waals ferromagnet.

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Presenters

  • Abhijeet Nayak

    • University of Notre Dame

Authors

  • Abhijeet Nayak

    • University of Notre Dame

  • SEKH JAMALUDDIN

    • University of Notre Dame

  • Som Guria

  • Yu Zhang

  • Fan Wu

  • Sara Bey

    • University of Notre Dame

  • Mohamed El Gazzah

    • University of Notre Dame

  • Resham Regmi

    • University of Notre Dame

  • John Mitchell

    • Argonne National Laboratory

  • Allen Oliver

  • Badih Assaf

    • University of Notre Dame

  • Kateryna Foyevtsova

  • Petr Stepanov

    • University of Notre Dame

  • Igor Mazin

    • George Mason University

  • Nirmal Ghimire

    • University of Notre Dame