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

Abstract 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, C4mimFeCl4. Magnetization measurements demonstrate that an antiferromagnetic ordering occurs...

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Autores principales:	Maiko Kofu, Ryuta Watanuki, Toshiro Sakakibara, Seiko Ohira-Kawamura, Kenji Nakajima, Masato Matsuura, Takeshi Ueki, Kazuhiro Akutsu, Osamu Yamamuro
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/92420f52927345899b2528cdbaa2b921
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spelling	oai:doaj.org-article:92420f52927345899b2528cdbaa2b9212021-12-02T14:58:25ZSpin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid10.1038/s41598-021-91619-z2045-2322https://doaj.org/article/92420f52927345899b2528cdbaa2b9212021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91619-zhttps://doaj.org/toc/2045-2322Abstract 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, C4mimFeCl4. 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.Maiko KofuRyuta WatanukiToshiro SakakibaraSeiko Ohira-KawamuraKenji NakajimaMasato MatsuuraTakeshi UekiKazuhiro AkutsuOsamu YamamuroNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Maiko Kofu Ryuta Watanuki Toshiro Sakakibara Seiko Ohira-Kawamura Kenji Nakajima Masato Matsuura Takeshi Ueki Kazuhiro Akutsu Osamu Yamamuro Spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
description	Abstract 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, C4mimFeCl4. 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.
format	article
author	Maiko Kofu Ryuta Watanuki Toshiro Sakakibara Seiko Ohira-Kawamura Kenji Nakajima Masato Matsuura Takeshi Ueki Kazuhiro Akutsu Osamu Yamamuro
author_facet	Maiko Kofu Ryuta Watanuki Toshiro Sakakibara Seiko Ohira-Kawamura Kenji Nakajima Masato Matsuura Takeshi Ueki Kazuhiro Akutsu Osamu Yamamuro
author_sort	Maiko Kofu
title	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_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_sort	spin glass behavior and magnetic boson peak in a structural glass of a magnetic ionic liquid
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/92420f52927345899b2528cdbaa2b921
work_keys_str_mv	AT maikokofu spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid AT ryutawatanuki spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid AT toshirosakakibara spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid AT seikoohirakawamura spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid AT kenjinakajima spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid AT masatomatsuura spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid AT takeshiueki spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid AT kazuhiroakutsu spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid AT osamuyamamuro spinglassbehaviorandmagneticbosonpeakinastructuralglassofamagneticionicliquid
_version_	1718389279615352832

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

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