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Mixed-cation driven magnetic interaction of interstitial electrons for ferrimagnetic two-dimensional electride

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Title
Mixed-cation driven magnetic interaction of interstitial electrons for ferrimagnetic two-dimensional electride
Author(s)
Seung Yong Lee; Bang, Joonho; Hyun Yong Song; Byung Il Yoo; Kim, Yeongkwan; Lee, Kimoon; Thapa, Dinesh; Kim, Seong-Gon; Sung Wng Kim
Publication Date
2021-03
Journal
npj Quantum Materials, v.6, no.1
Publisher
Nature Research
Abstract
© 2021, The Author(s).Magnetism of pure electrons is fundamental for understanding diverse magnetic phenomena in condensed matters but has not been fully investigated in experiments due to the lack of a tractable model system. Such an exotic material necessitates an exclusive magnetic interaction of electrons being devoid of orbital and lattice degrees of freedom. Here, we report the two-dimensional mixed-cation [YGdC]2+∙2e− electride, showing ferrimagnetic nature from the direct exchange interaction of magnetic interstitial electrons in interlayer space. We identify that magnetic interstitial electrons are periodically localized in octahedral and tetrahedral cavities between 2D cationic Y2−xGdx arrays. The mixed configuration of non-magnetic and magnetic cations in cavities induces divergent spin states and interactions of magnetic interstitial electrons, in which their direct exchange interaction overwhelms the interactions with magnetic cations, triggering the ferrimagnetic spin-alignment. This discovery facilitates further exploration of magnetic electrides and nurtures the study of two-dimensional magnetism of layered crystals and electron phases.
URI
https://pr.ibs.re.kr/handle/8788114/9464
DOI
10.1038/s41535-021-00319-4
ISSN
2397-4648
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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