Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds

Abstract Magnetic properties of Mott–Hubbard systems are generally dominated by strong antiferromagnetic interactions produced by the Coulomb repulsion of electrons. Although theoretical possibility of a ferromagnetic ground state has been suggested by Nagaoka and Penn as single-hole doping in a Mot...

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Autores principales:	Ryo Yoshimoto, Satoshi Yamashita, Hiroki Akutsu, Yasuhiro Nakazawa, Tetsuro Kusamoto, Yugo Oshima, Takehito Nakano, Hiroshi M. Yamamoto, Reizo Kato
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/05ac55574b52468e84a24b2d9933d7e5
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spelling	oai:doaj.org-article:05ac55574b52468e84a24b2d9933d7e52021-12-02T15:23:04ZElectric dipole induced bulk ferromagnetism in dimer Mott molecular compounds10.1038/s41598-020-79262-62045-2322https://doaj.org/article/05ac55574b52468e84a24b2d9933d7e52021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79262-6https://doaj.org/toc/2045-2322Abstract Magnetic properties of Mott–Hubbard systems are generally dominated by strong antiferromagnetic interactions produced by the Coulomb repulsion of electrons. Although theoretical possibility of a ferromagnetic ground state has been suggested by Nagaoka and Penn as single-hole doping in a Mott insulator, experimental realization has not been reported more than half century. We report the first experimental possibility of such ferromagnetism in a molecular Mott insulator with an extremely light and homogeneous hole-doping in π-electron layers induced by net polarization of counterions. A series of Ni(dmit)2 anion radical salts with organic cations, where dmit is 1,3-dithiole-2-thione-4,5-dithiolate can form bi-layer structure with polarized cation layers. Heat capacity, magnetization, and ESR measurements substantiated the formation of a bulk ferromagnetic state around 1.0 K with quite soft magnetization versus magnetic field (M–H) characteristics in (Et-4BrT)[Ni(dmit)2]2 where Et-4BrT is ethyl-4-bromothiazolium. The variation of the magnitude of net polarizations by using the difference of counter cations revealed the systematic change of the ground state from antiferromagnetic one to ferromagnetic one. We also report emergence of metallic states through further doping and applying external pressures for this doping induced ferromagnetic state. The realization of ferromagnetic state in Nagaoka–Penn mechanism can paves a way for designing new molecules-based ferromagnets in future.Ryo YoshimotoSatoshi YamashitaHiroki AkutsuYasuhiro NakazawaTetsuro KusamotoYugo OshimaTakehito NakanoHiroshi M. YamamotoReizo KatoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ryo Yoshimoto Satoshi Yamashita Hiroki Akutsu Yasuhiro Nakazawa Tetsuro Kusamoto Yugo Oshima Takehito Nakano Hiroshi M. Yamamoto Reizo Kato Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds
description	Abstract Magnetic properties of Mott–Hubbard systems are generally dominated by strong antiferromagnetic interactions produced by the Coulomb repulsion of electrons. Although theoretical possibility of a ferromagnetic ground state has been suggested by Nagaoka and Penn as single-hole doping in a Mott insulator, experimental realization has not been reported more than half century. We report the first experimental possibility of such ferromagnetism in a molecular Mott insulator with an extremely light and homogeneous hole-doping in π-electron layers induced by net polarization of counterions. A series of Ni(dmit)2 anion radical salts with organic cations, where dmit is 1,3-dithiole-2-thione-4,5-dithiolate can form bi-layer structure with polarized cation layers. Heat capacity, magnetization, and ESR measurements substantiated the formation of a bulk ferromagnetic state around 1.0 K with quite soft magnetization versus magnetic field (M–H) characteristics in (Et-4BrT)[Ni(dmit)2]2 where Et-4BrT is ethyl-4-bromothiazolium. The variation of the magnitude of net polarizations by using the difference of counter cations revealed the systematic change of the ground state from antiferromagnetic one to ferromagnetic one. We also report emergence of metallic states through further doping and applying external pressures for this doping induced ferromagnetic state. The realization of ferromagnetic state in Nagaoka–Penn mechanism can paves a way for designing new molecules-based ferromagnets in future.
format	article
author	Ryo Yoshimoto Satoshi Yamashita Hiroki Akutsu Yasuhiro Nakazawa Tetsuro Kusamoto Yugo Oshima Takehito Nakano Hiroshi M. Yamamoto Reizo Kato
author_facet	Ryo Yoshimoto Satoshi Yamashita Hiroki Akutsu Yasuhiro Nakazawa Tetsuro Kusamoto Yugo Oshima Takehito Nakano Hiroshi M. Yamamoto Reizo Kato
author_sort	Ryo Yoshimoto
title	Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds
title_short	Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds
title_full	Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds
title_fullStr	Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds
title_full_unstemmed	Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds
title_sort	electric dipole induced bulk ferromagnetism in dimer mott molecular compounds
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/05ac55574b52468e84a24b2d9933d7e5
work_keys_str_mv	AT ryoyoshimoto electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds AT satoshiyamashita electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds AT hirokiakutsu electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds AT yasuhironakazawa electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds AT tetsurokusamoto electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds AT yugooshima electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds AT takehitonakano electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds AT hiroshimyamamoto electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds AT reizokato electricdipoleinducedbulkferromagnetismindimermottmolecularcompounds
_version_	1718387306485776384

Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds

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