High-field magnetization process in free radical and metal-assembled molecular magnets

T. Asano, Y. Inagaki, Y. Ajiro, H. Matsubara, K. Mukai, N. Matsumoto, H. Mitamura, T. Goto, Y. Narumi, K. Kindo, H. Hori

Research output: Contribution to journalConference article

Abstract

We applied the high-field technique to study the magnetization process in model substances. Measurements have been performed on the powder samples under a pulsed magnetic field up to 50 T. A family of organic verdazyl radical is a candidate of an isotropic S = 1/2 antiferromagnetic linear chain model. The observed magnetization is practically zero up to a certain critical field around 40 T and steeply increases to the saturation value of 1 μB/molecule. The feature cannot be explained by the uniform chain model but agrees with the alternation linear chain model closed to the dimer model in which the ground state is a nonmagnetic singlet with an energy gap between the excited triplet state. Metal-assembled tetranuclear complexes [Mn(MeOH)L(OH)M(bpy)]2 represent a prototype of geometrically frustrated spin systems. We observed a step-like magnetization process which clearly shows the successive transitions among quantum states with different total spins.

Original languageEnglish
Pages (from-to)427/109 - 432/114
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume343
Publication statusPublished - Jan 1 2000
EventProceedings of the International Symposium Molecular Design and Funtionalities of Assambled Metals Complexes (AMC'99) - Kyoto, Jpn
Duration: Nov 30 1999Dec 2 1999

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Free radicals
free radicals
Free Radicals
Magnets
Magnetization
magnets
Metals
magnetization
metals
alternations
Excited states
Dimers
Powders
Ground state
atomic energy levels
Energy gap
prototypes
dimers
Magnetic fields
saturation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

High-field magnetization process in free radical and metal-assembled molecular magnets. / Asano, T.; Inagaki, Y.; Ajiro, Y.; Matsubara, H.; Mukai, K.; Matsumoto, N.; Mitamura, H.; Goto, T.; Narumi, Y.; Kindo, K.; Hori, H.

In: Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, Vol. 343, 01.01.2000, p. 427/109 - 432/114.

Research output: Contribution to journalConference article

Asano, T, Inagaki, Y, Ajiro, Y, Matsubara, H, Mukai, K, Matsumoto, N, Mitamura, H, Goto, T, Narumi, Y, Kindo, K & Hori, H 2000, 'High-field magnetization process in free radical and metal-assembled molecular magnets', Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, vol. 343, pp. 427/109 - 432/114.
Asano, T. ; Inagaki, Y. ; Ajiro, Y. ; Matsubara, H. ; Mukai, K. ; Matsumoto, N. ; Mitamura, H. ; Goto, T. ; Narumi, Y. ; Kindo, K. ; Hori, H. / High-field magnetization process in free radical and metal-assembled molecular magnets. In: Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals. 2000 ; Vol. 343. pp. 427/109 - 432/114.
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AU - Asano, T.

AU - Inagaki, Y.

AU - Ajiro, Y.

AU - Matsubara, H.

AU - Mukai, K.

AU - Matsumoto, N.

AU - Mitamura, H.

AU - Goto, T.

AU - Narumi, Y.

AU - Kindo, K.

AU - Hori, H.

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N2 - We applied the high-field technique to study the magnetization process in model substances. Measurements have been performed on the powder samples under a pulsed magnetic field up to 50 T. A family of organic verdazyl radical is a candidate of an isotropic S = 1/2 antiferromagnetic linear chain model. The observed magnetization is practically zero up to a certain critical field around 40 T and steeply increases to the saturation value of 1 μB/molecule. The feature cannot be explained by the uniform chain model but agrees with the alternation linear chain model closed to the dimer model in which the ground state is a nonmagnetic singlet with an energy gap between the excited triplet state. Metal-assembled tetranuclear complexes [Mn(MeOH)L(OH)M(bpy)]2 represent a prototype of geometrically frustrated spin systems. We observed a step-like magnetization process which clearly shows the successive transitions among quantum states with different total spins.

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