Gapless Dirac magnons in CrCl3
Abstract Bosonic Dirac materials are testbeds for dissipationless spin-based electronics. In the quasi two-dimensional honeycomb lattice of CrX3 (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 s...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-06-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-022-00473-3 |
| _version_ | 1818547123074891776 |
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| author | John A. Schneeloch Yu Tao Yongqiang Cheng Luke Daemen Guangyong Xu Qiang Zhang Despina Louca |
| author_facet | John A. Schneeloch Yu Tao Yongqiang Cheng Luke Daemen Guangyong Xu Qiang Zhang Despina Louca |
| author_sort | John A. Schneeloch |
| collection | DOAJ |
| description | Abstract Bosonic Dirac materials are testbeds for dissipationless spin-based electronics. In the quasi two-dimensional honeycomb lattice of CrX3 (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 CrBr3 and CrI3, gapless Dirac magnons are present in bulk CrCl3, 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. |
| first_indexed | 2024-12-12T08:02:28Z |
| format | Article |
| id | doaj.art-a1874daa72e6455799dbfae2e116f6dd |
| institution | Directory Open Access Journal |
| issn | 2397-4648 |
| language | English |
| last_indexed | 2024-12-12T08:02:28Z |
| publishDate | 2022-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj.art-a1874daa72e6455799dbfae2e116f6dd2022-12-22T00:32:05ZengNature Portfolionpj Quantum Materials2397-46482022-06-01711710.1038/s41535-022-00473-3Gapless Dirac magnons in CrCl3John A. Schneeloch0Yu Tao1Yongqiang Cheng2Luke Daemen3Guangyong Xu4Qiang Zhang5Despina Louca6Department of Physics, University of VirginiaDepartment of Physics, University of VirginiaNeutron Scattering Division, Oak Ridge National LaboratoryNeutron Scattering Division, Oak Ridge National LaboratoryNIST Center for Neutron Research, National Institute of Standards and TechnologyNeutron Scattering Division, Oak Ridge National LaboratoryDepartment of Physics, University of VirginiaAbstract Bosonic Dirac materials are testbeds for dissipationless spin-based electronics. In the quasi two-dimensional honeycomb lattice of CrX3 (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 CrBr3 and CrI3, gapless Dirac magnons are present in bulk CrCl3, 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.https://doi.org/10.1038/s41535-022-00473-3 |
| spellingShingle | John A. Schneeloch Yu Tao Yongqiang Cheng Luke Daemen Guangyong Xu Qiang Zhang Despina Louca Gapless Dirac magnons in CrCl3 npj Quantum Materials |
| title | Gapless Dirac magnons in CrCl3 |
| title_full | Gapless Dirac magnons in CrCl3 |
| title_fullStr | Gapless Dirac magnons in CrCl3 |
| title_full_unstemmed | Gapless Dirac magnons in CrCl3 |
| title_short | Gapless Dirac magnons in CrCl3 |
| title_sort | gapless dirac magnons in crcl3 |
| url | https://doi.org/10.1038/s41535-022-00473-3 |
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