High-Field Magnetization Process in Free Radical and Metal-Assembled Molecular Magnets
作者:
T. Asano,
Y. Inagaki,
Y. Ajiro,
H. Matsubara,
K. Mukai,
N. Matsumoto,
H. Mitamura,
T. Goto,
Y. Narumi,
K. Kindo,
H. Hori,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 343,
issue 1
页码: 109-114
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008023511
出版商: Taylor & Francis Group
关键词: high-field;magnetization;free-radical;quantum-spin;low-dimensional;alternating-bond
数据来源: Taylor
摘要:
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 isotropicS= 1/2 antiferro-magnetic 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)]2represent 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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