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Gapless Dirac magnons in CrCl3

التفاصيل البيبلوغرافية
العنوان: Gapless Dirac magnons in CrCl3
المؤلفون: John A. Schneeloch, Yu Tao, Yongqiang Cheng, Luke Daemen, Guangyong Xu, Qiang Zhang, Despina Louca
المصدر: npj Quantum Materials, Vol 7, Iss 1, Pp 1-7 (2022)
بيانات النشر: Nature Portfolio, 2022.
سنة النشر: 2022
المجموعة: LCC:Materials of engineering and construction. Mechanics of materials
LCC:Atomic physics. Constitution and properties of matter
مصطلحات موضوعية: Materials of engineering and construction. Mechanics of materials, TA401-492, Atomic physics. Constitution and properties of matter, QC170-197
الوصف: 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.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2397-4648
Relation: https://doaj.org/toc/2397-4648
DOI: 10.1038/s41535-022-00473-3
URL الوصول: https://doaj.org/article/a1874daa72e6455799dbfae2e116f6dd
رقم الأكسشن: edsdoj.1874daa72e6455799dbfae2e116f6dd
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:23974648
DOI:10.1038/s41535-022-00473-3