Critical spin fluctuations in the Dirac metal CoTe<sub>2</sub>

ORAL

Abstract

Quantum critical points separating weak ferromagnetic metals and metallic paramagnetic phases are associated with a variety of novel physical phenomena.  These include novel ground states like triplet superconductors, non-Fermi liquid scaling, and unusual magnetotransport behavior originating from the presence of dynamical spin fluctuations responsible for not only suppressing the magnetic ordering, but also resulting in the unusual transport properties. Here, by means of magnetic, thermal, transport measurements, and first principles calculations, we show that the orthorhombic CoTe2 with the Marcasite structure displays a lack of long-range magnetic ordering due to the strong critical spin fluctuations. Further the electronic transport yields metallic behavior with a weak linear magnetoresistance, a response typically indicative of Dirac physics present in the band structure of this material.

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Presenters

  • Peter Siegfried

    • George Mason University
    • Quantum Science and Engineering Center, Department of Physics and Astronomy-George Mason University
    • Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University

Authors

  • Peter Siegfried

    • George Mason University
    • Quantum Science and Engineering Center, Department of Physics and Astronomy-George Mason University
    • Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University

  • Hari Bhandari

    • Quantum Science and Engineering Center, Department of Physics and Astronomy-George Mason University
    • Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University

  • Jeanie Qi

    • Thomas Jefferson High School for Science and Technology

  • Yanliu Dang

    • Materials Science and Engineering Division, National Institute of Science and Technology
    • Materials Science and Engineering Division - National Institute of Standards and Technology

  • Albert Davydov

    • Materials Science and Engineering Division, National Institute of Science and Technology
    • National Institute of Standards and Technology
    • Materials Science and Engineering Division - National Institute of Standards and Technology

  • Jaydeep Joshi

    • Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University
    • George Mason University

  • Patrick M Vora

    • George Mason University
    • Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University

  • Igor Mazin

    • George Mason University
    • Department of Physics and Astronomy and Quantum Science and Engineering Center, George Mason University, Fairfax, Virginia 22030, USA
    • Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University

  • Nirmal Ghimire

    • George Mason University
    • Quantum Science and Engineering Center, Department of Physics and Astronomy-George Mason University
    • Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University