Gapless Dirac magnons in CrCl3

Schneeloch, John A.; Tao, Yu; Cheng, Yongqiang; Daemen, Luke; Xu, Guangyong; Zhang, Qiang; Louca, Despina

doi:10.1038/s41535-022-00473-3

Title: Gapless Dirac magnons in CrCl3

Abstract

Abstract Bosonic Dirac materials are testbeds for dissipationless spin-based electronics. In the quasi two-dimensional honeycomb lattice of CrX ₃ (X = Cl, Br, I), Dirac magnons have been predicted at the crossing of acoustical and optical spin waves, analogous to Dirac fermions in graphene. Here we show that, distinct from CrBr ₃ and CrI ₃ , gapless Dirac magnons are present in bulk CrCl ₃ , with inelastic neutron scattering intensity at low temperatures approaching zero at the Dirac K point. Upon warming, magnon-magnon interactions induce strong renormalization and decreased lifetimes, with a ~25% softening of the upper magnon branch intensity from 5 to 50 K, though magnon features persist well above T _N . Moreover, on cooling below ~50 K, an anomalous increase in the a -axis lattice constant and a hardening of a ~26 meV phonon feature are observed, indicating magnetoelastic and spin-phonon coupling arising from an increase in the in-plane spin correlations that begins tens of Kelvin above T _N .

Authors:

; Tao, Yu; Cheng, Yongqiang; Daemen, Luke;

; Zhang, Qiang; Louca, Despina

Publication Date:: Wed Jun 22 00:00:00 EDT 2022

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program

OSTI Identifier:: 1873590

Alternate Identifier(s):: OSTI ID: 1883772

Grant/Contract Number:: FG02-01ER45927; AC05-00OR22725

Resource Type:: Published Article

Journal Name:: npj Quantum Materials

Additional Journal Information:: Journal Name: npj Quantum Materials Journal Volume: 7 Journal Issue: 1; Journal ID: ISSN 2397-4648

Publisher:: Nature Publishing Group

Country of Publication:: United Kingdom

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Schneeloch, John A., Tao, Yu, Cheng, Yongqiang, Daemen, Luke, Xu, Guangyong, Zhang, Qiang, and Louca, Despina. Gapless Dirac magnons in CrCl3.  United Kingdom: N. p., 2022. 
Web.  doi:10.1038/s41535-022-00473-3.

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                    Schneeloch, John A., Tao, Yu, Cheng, Yongqiang, Daemen, Luke, Xu, Guangyong, Zhang, Qiang, & Louca, Despina. Gapless Dirac magnons in CrCl3.  United Kingdom.  https://doi.org/10.1038/s41535-022-00473-3

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                    Schneeloch, John A., Tao, Yu, Cheng, Yongqiang, Daemen, Luke, Xu, Guangyong, Zhang, Qiang, and Louca, Despina. Wed .  
"Gapless Dirac magnons in CrCl3".  United Kingdom.  https://doi.org/10.1038/s41535-022-00473-3.

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@article{osti_1873590,

  title        = {Gapless Dirac magnons in CrCl3},

  author       = {Schneeloch, John A. and Tao, Yu and Cheng, Yongqiang and Daemen, Luke and Xu, Guangyong and Zhang, Qiang and Louca, Despina},

  abstractNote = {Abstract Bosonic Dirac materials are testbeds for dissipationless spin-based electronics. In the quasi two-dimensional honeycomb lattice of CrX 3 (X = Cl, Br, I), Dirac magnons have been predicted at the crossing of acoustical and optical spin waves, analogous to Dirac fermions in graphene. Here we show that, distinct from CrBr 3 and CrI 3 , gapless Dirac magnons are present in bulk CrCl 3 , with inelastic neutron scattering intensity at low temperatures approaching zero at the Dirac K point. Upon warming, magnon-magnon interactions induce strong renormalization and decreased lifetimes, with a ~25% softening of the upper magnon branch intensity from 5 to 50 K, though magnon features persist well above T N . Moreover, on cooling below ~50 K, an anomalous increase in the a -axis lattice constant and a hardening of a ~26 meV phonon feature are observed, indicating magnetoelastic and spin-phonon coupling arising from an increase in the in-plane spin correlations that begins tens of Kelvin above T N .},

  doi          = {10.1038/s41535-022-00473-3},

  journal      = {npj Quantum Materials},

  number       = 1,

  volume       = 7,

  place        = {United Kingdom},

  year         = {Wed Jun 22 00:00:00 EDT 2022},

  month        = {Wed Jun 22 00:00:00 EDT 2022}

}

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Title: Gapless Dirac magnons in CrCl3

Abstract

Citation Formats

Magnetic phase diagram, magnetoelastic coupling, and Grüneisen scaling in CoTiO 3 journal, July 2021

Generalized Gradient Approximation Made Simple journal, October 1996

POWGEN: rebuild of a third-generation powder diffractometer at the Spallation Neutron Source journal, October 2019

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X‐Ray Diffraction and Nuclear Quadrupole Resonance Studies of Chromium Trichloride journal, April 1964

Magnetic Ordering in CrCl3 at the Phase Transition journal, July 1982

Spin-Wave Renormalization Applied to Ferromagnetic Cr Br 3 journal, April 1964

Projector augmented-wave method journal, December 1994

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Gigahertz Frequency Antiferromagnetic Resonance and Strong Magnon-Magnon Coupling in the Layered Crystal CrCl 3 journal, July 2019

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Oxidation energies of transition metal oxides within the GGA + U framework journal, May 2006

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journal, October 1996

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journal, October 2019

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Monoclinic crystal structure of $α - {RuCl}_{3}$ and the zigzag antiferromagnetic ground state
journal, December 2015

X‐Ray Diffraction and Nuclear Quadrupole Resonance Studies of Chromium Trichloride
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Crystal Statistics. I. A Two-Dimensional Model with an Order-Disorder Transition
journal, February 1944

Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl ₃
journal, October 2021

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Neutron Scattering Study of the Phase Transition in Two-Dimensional Planar Ferromagnet K ₂ CuF ₄
journal, July 1982

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Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set
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Resolution of VISION, a crystal-analyzer spectrometer
journal, June 2009

Chemical accuracy for the van der Waals density functional
journal, December 2009

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journal, January 2019

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journal, April 2017

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journal, August 1961

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Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides
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Realization of the Haldane-Kane-Mele Model in a System of Localized Spins
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