Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid

Glassy magnetic behavior has been observed in a wide range of crystalline magnetic materials called spin glass. Here, we report spin glass behavior in a structural glass of a magnetic ionic liquid, C4mimFeCl(4). Magnetization measurements demonstrate that an antiferromagnetic ordering occurs at T(N)...

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Autores principales: Kofu, Maiko, Watanuki, Ryuta, Sakakibara, Toshiro, Ohira-Kawamura, Seiko, Nakajima, Kenji, Matsuura, Masato, Ueki, Takeshi, Akutsu, Kazuhiro, Yamamuro, Osamu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
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Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8187720/
https://www.ncbi.nlm.nih.gov/pubmed/34103650
http://dx.doi.org/10.1038/s41598-021-91619-z
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author Kofu, Maiko
Watanuki, Ryuta
Sakakibara, Toshiro
Ohira-Kawamura, Seiko
Nakajima, Kenji
Matsuura, Masato
Ueki, Takeshi
Akutsu, Kazuhiro
Yamamuro, Osamu
author_facet Kofu, Maiko
Watanuki, Ryuta
Sakakibara, Toshiro
Ohira-Kawamura, Seiko
Nakajima, Kenji
Matsuura, Masato
Ueki, Takeshi
Akutsu, Kazuhiro
Yamamuro, Osamu
author_sort Kofu, Maiko
collection PubMed
description Glassy magnetic behavior has been observed in a wide range of crystalline magnetic materials called spin glass. Here, we report spin glass behavior in a structural glass of a magnetic ionic liquid, C4mimFeCl(4). Magnetization measurements demonstrate that an antiferromagnetic ordering occurs at T(N) = 2.3 K in the crystalline state, while a spin glass transition occurs at T(SG) = 0.4 K in the structural glass state. In addition, localized magnetic excitations were found in the spin glass state by inelastic neutron scattering, in contrast to spin-wave excitations in the ordered phase of the crystalline sample. The localized excitation was scaled by the Bose population factor below T(SG) and gradually disappeared above T(SG). This feature is highly reminiscent of boson peaks commonly observed in structural glasses. We suggest the “magnetic” boson peak to be one of the inherent dynamics of a spin glass state.
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spelling pubmed-81877202021-06-10 Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid Kofu, Maiko Watanuki, Ryuta Sakakibara, Toshiro Ohira-Kawamura, Seiko Nakajima, Kenji Matsuura, Masato Ueki, Takeshi Akutsu, Kazuhiro Yamamuro, Osamu Sci Rep Article Glassy magnetic behavior has been observed in a wide range of crystalline magnetic materials called spin glass. Here, we report spin glass behavior in a structural glass of a magnetic ionic liquid, C4mimFeCl(4). Magnetization measurements demonstrate that an antiferromagnetic ordering occurs at T(N) = 2.3 K in the crystalline state, while a spin glass transition occurs at T(SG) = 0.4 K in the structural glass state. In addition, localized magnetic excitations were found in the spin glass state by inelastic neutron scattering, in contrast to spin-wave excitations in the ordered phase of the crystalline sample. The localized excitation was scaled by the Bose population factor below T(SG) and gradually disappeared above T(SG). This feature is highly reminiscent of boson peaks commonly observed in structural glasses. We suggest the “magnetic” boson peak to be one of the inherent dynamics of a spin glass state. Nature Publishing Group UK 2021-06-08 /pmc/articles/PMC8187720/ /pubmed/34103650 http://dx.doi.org/10.1038/s41598-021-91619-z Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Kofu, Maiko
Watanuki, Ryuta
Sakakibara, Toshiro
Ohira-Kawamura, Seiko
Nakajima, Kenji
Matsuura, Masato
Ueki, Takeshi
Akutsu, Kazuhiro
Yamamuro, Osamu
Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
title Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
title_full Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
title_fullStr Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
title_full_unstemmed Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
title_short Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
title_sort spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8187720/
https://www.ncbi.nlm.nih.gov/pubmed/34103650
http://dx.doi.org/10.1038/s41598-021-91619-z
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