Pressure Effect of Organic Ferromagnetic Radical Crystal p-Cl-C6H4CH=N-TEMPO

Masaki Mito, Tatsuya Kawae, Kazuyoshi Takeda, Takayuki Ishida, Takashi Nogami

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

4-(p-chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-yloxyl) (p-Cl-C6H4CH=N-TEMPO) radical crystal is the organic bulk-ferromagnet with Tc(P0) = 0.28 K (P0; ambient pressure). In realizing the ferromagnetic intermolecular interaction, the spin polarization on the hydrogen of the methyl moiety is considered to play an important role. We expected that the pressurization would change the environment around the methyl moiety, and influence the bulk-ferromagnetic transition. So we measured the ac magnetic susceptibility under the pressure up to 10.9 kbar. With increasing pressure, the periodical down-and-up of Tc(P) and the pressure-induced ferro- to antiferromagnetic transition were observed. These experimental results may suggest that the pressurization destroys the bulk-ferromagnetism of P-Cl-C6H4CH=N-TEMPO as in β-phase p-NPNN, making the methyl moiety rotate.

Original languageEnglish
Pages (from-to)323-332
Number of pages10
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume334
DOIs
Publication statusPublished - Jan 1 1999

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Pressure effects
pressure effects
Crystals
Pressurization
crystals
Spin polarization
Ferromagnetism
Magnetic susceptibility
ferromagnetism
Hydrogen
magnetic permeability
TEMPO
polarization
hydrogen
interactions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Pressure Effect of Organic Ferromagnetic Radical Crystal p-Cl-C6H4CH=N-TEMPO. / Mito, Masaki; Kawae, Tatsuya; Takeda, Kazuyoshi; Ishida, Takayuki; Nogami, Takashi.

In: Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, Vol. 334, 01.01.1999, p. 323-332.

Research output: Contribution to journalArticle

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abstract = "4-(p-chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-yloxyl) (p-Cl-C6H4CH=N-TEMPO) radical crystal is the organic bulk-ferromagnet with Tc(P0) = 0.28 K (P0; ambient pressure). In realizing the ferromagnetic intermolecular interaction, the spin polarization on the hydrogen of the methyl moiety is considered to play an important role. We expected that the pressurization would change the environment around the methyl moiety, and influence the bulk-ferromagnetic transition. So we measured the ac magnetic susceptibility under the pressure up to 10.9 kbar. With increasing pressure, the periodical down-and-up of Tc(P) and the pressure-induced ferro- to antiferromagnetic transition were observed. These experimental results may suggest that the pressurization destroys the bulk-ferromagnetism of P-Cl-C6H4CH=N-TEMPO as in β-phase p-NPNN, making the methyl moiety rotate.",
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AU - Mito, Masaki

AU - Kawae, Tatsuya

AU - Takeda, Kazuyoshi

AU - Ishida, Takayuki

AU - Nogami, Takashi

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N2 - 4-(p-chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-yloxyl) (p-Cl-C6H4CH=N-TEMPO) radical crystal is the organic bulk-ferromagnet with Tc(P0) = 0.28 K (P0; ambient pressure). In realizing the ferromagnetic intermolecular interaction, the spin polarization on the hydrogen of the methyl moiety is considered to play an important role. We expected that the pressurization would change the environment around the methyl moiety, and influence the bulk-ferromagnetic transition. So we measured the ac magnetic susceptibility under the pressure up to 10.9 kbar. With increasing pressure, the periodical down-and-up of Tc(P) and the pressure-induced ferro- to antiferromagnetic transition were observed. These experimental results may suggest that the pressurization destroys the bulk-ferromagnetism of P-Cl-C6H4CH=N-TEMPO as in β-phase p-NPNN, making the methyl moiety rotate.

AB - 4-(p-chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-yloxyl) (p-Cl-C6H4CH=N-TEMPO) radical crystal is the organic bulk-ferromagnet with Tc(P0) = 0.28 K (P0; ambient pressure). In realizing the ferromagnetic intermolecular interaction, the spin polarization on the hydrogen of the methyl moiety is considered to play an important role. We expected that the pressurization would change the environment around the methyl moiety, and influence the bulk-ferromagnetic transition. So we measured the ac magnetic susceptibility under the pressure up to 10.9 kbar. With increasing pressure, the periodical down-and-up of Tc(P) and the pressure-induced ferro- to antiferromagnetic transition were observed. These experimental results may suggest that the pressurization destroys the bulk-ferromagnetism of P-Cl-C6H4CH=N-TEMPO as in β-phase p-NPNN, making the methyl moiety rotate.

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