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

Bulletin of the American Physical Society

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APS March Meeting 2022

Volume 67, Number 3

Monday–Friday, March 14–18, 2022; Chicago

Session F59: Correlated Topology I: Kondo Insulators, Kagome Material, etc.

8:00 AM–10:48 AM, Tuesday, March 15, 2022
Room: Hyatt Regency Hotel -DuSable AB

Sponsoring Unit: DCMP
Chair: Kai Sun, University of Michigan

Abstract: F59.00012 : Critical spin fluctuations in the Dirac metal CoTe₂

10:12 AM–10:24 AM

Abstract

Presenter:

Peter Siegfried
(Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University)

Authors:

Peter Siegfried
(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)

Jeanie Qi
(Thomas Jefferson High School for Science and Technology)

Yanliu Dang
(Materials Science and Engineering Division - National Institute of Standards and Technology)

Albert Davydov
(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)

Patrick M Vora
(Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University)

Igor Mazin
(Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University)

Nirmal Ghimire
(Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University)

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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Bulletin of the American Physical Society

APS March Meeting 2022

Volume 67, Number 3

Monday–Friday, March 14–18, 2022; Chicago

Session F59: Correlated Topology I: Kondo Insulators, Kagome Material, etc.

Abstract: F59.00012 : Critical spin fluctuations in the Dirac metal CoTe2

Presenter:

Authors:

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Abstract: F59.00012 : Critical spin fluctuations in the Dirac metal CoTe₂