Ferromagnetic quasi-atomic electrons in two-dimensional electride

Seung Yong Lee, Jae-Yeol Hwang, Jongho Park, Chandani N. Nandadasa, Younghak Kim, Joonho Bang, Kimoon Lee, Kyu Hyoung Lee, Yunwei Zhang, Yanming Ma, Hideo Hosono, Young Hee Lee, Seong-Gon Kim and Sung Wng Kim ()
Additional contact information
Seung Yong Lee: Sungkyunkwan University
Jae-Yeol Hwang: Sungkyunkwan University
Jongho Park: Sungkyunkwan University
Chandani N. Nandadasa: Mississippi State University
Younghak Kim: Pohang University of Science and Technology
Joonho Bang: Sungkyunkwan University
Kimoon Lee: Kunsan National University
Kyu Hyoung Lee: Yonsei University
Yunwei Zhang: Jilin University
Yanming Ma: Jilin University
Hideo Hosono: Tokyo Institute of Technology
Young Hee Lee: Institute for Basic Science
Seong-Gon Kim: Mississippi State University
Sung Wng Kim: Sungkyunkwan University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract An electride, a generalized form of cavity-trapped interstitial anionic electrons (IAEs) in a positively charged lattice framework, shows exotic properties according to the size and geometry of the cavities. Here, we report that the IAEs in layer structured [Gd2C]2+·2e− electride behave as ferromagnetic elements in two-dimensional interlayer space and possess their own magnetic moments of ~0.52 μB per quasi-atomic IAE, which facilitate the exchange interactions between interlayer gadolinium atoms across IAEs, inducing the ferromagnetism in [Gd2C]2+·2e− electride. The substitution of paramagnetic chlorine atoms for IAEs proves the magnetic nature of quasi-atomic IAEs through a transition from ferromagnetic [Gd2C]2+·2e− to antiferromagnetic Gd2CCl caused by attenuating interatomic exchange interactions, consistent with theoretical calculations. These results confirm that quasi-atomic IAEs act as ferromagnetic elements and trigger ferromagnetic spin alignments within the antiferromagnetic [Gd2C]2+ lattice framework. These results present a broad opportunity to tailor intriguing ferromagnetism originating from quasi-atomic interstitial electrons in low-dimensional materials.

Date: 2020
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DOI: 10.1038/s41467-020-15253-5

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