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Van der Waals electride: Toward intrinsic two-dimensional ferromagnetism of spin-polarized anionic electrons

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Title
Van der Waals electride: Toward intrinsic two-dimensional ferromagnetism of spin-polarized anionic electrons
Author(s)
Hyun Yong Song; Byung Il Yoo; Choi, Jin-Ho; Kang, Se-Hwang; Bang, Joonho; Li, Wei; Nandadasa, Chandani N.; Thapa, Dinesh; Duhee Yoon; Han, Myung Joon; Lee, Kyu Hyoung; Kim, Seong Gon; Lee, Kimoon; Sung Wng Kim
Publication Date
2021-09
Journal
Materials Today Physics, v.20
Publisher
Elsevier Ltd
Abstract
© 2021 The Author(s). Published by Elsevier Ltd. Discoveries of two-dimensional (2D) magnetism originated from confined atomic layers in van der Waals (vdW) crystals provide an interesting arena for elucidating its fundamentals and enrich magneto-electric and quantum properties. However, a material that exhibits intrinsic 2D magnetism of interstitial electrons occupying layered space, as a root system of magnetic vdW crystals, remains obscure. In this work, 2D ferromagnetic vdW electride, [RECl]2+·2e− (RE = Y and La) is reported with perfectly isolated ferromagnetic 2D blocks encompassing quasi-atomic electron layers. The ferromagnetism of the vdW electride with Curie temperature of 100 K originates from the spin-polarized quasi-atomic electrons with a substantial moment up to ∼0.91 Bohr magneton, which behave as magnetic elements in paramagnetic lattice framework. Invariable ferromagnetism at the monolayer limit strongly supports the 2D ferromagnetism of quasi-atomic electrons. These findings expand the variety of 2D magnetic crystals, providing a promising platform to study the emergent magnetism of low-dimensional electron phases.
URI
https://pr.ibs.re.kr/handle/8788114/10098
DOI
10.1016/j.mtphys.2021.100473
ISSN
2542-5293
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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