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Magnetic torque and ac and dc magnetic susceptibility measurements on PTMA0.5[Fe(Pc)(CN)2]・CH3CN: Origin of spontaneous magnetization in [Fe(Pc)(CN)2] molecular conductors

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Title: Magnetic torque and ac and dc magnetic susceptibility measurements on PTMA0.5[Fe(Pc)(CN)2]・CH3CN: Origin of spontaneous magnetization in [Fe(Pc)(CN)2] molecular conductors
Authors: Tajima, Hiroyuki Browse this author
Yoshida, Gosuke Browse this author
Matsuda, Masaki Browse this author
Yamaura, Jun-Ichi Browse this author
Hanasaki, Noriaki Browse this author
Naito, Toshio Browse this author →KAKEN DB
Inabe, Tamotsu Browse this author
Keywords: antiferromagnetic materials
ferrimagnetic materials
Heisenberg model
magnetic susceptibility
magnetisation
organic compounds
torque
Issue Date: Jul-2009
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 80
Issue: 2
Start Page: 024424
Publisher DOI: 10.1103/PhysRevB.80.024424
Abstract: Magnetic torque (3≤T≤46 K), dc magnetic susceptibility (2≤T≤300 K), and ac magnetic susceptibility (2≤T≤30 K) are reported for PTMA0.5[Fe(Pc)(CN)2]・CH3CN. The torque curves exhibit a sinusoidal line shape for temperatures above 6 K. This result as well as the temperature dependence of the dc magnetic susceptibility above 13 K was analyzed by employing an anisotropic Heisenberg model in one dimension. The compound exhibits spontaneous magnetization below 6 K. The torque measurements at 3 K revealed that the direction of this spontaneous magnetization is parallel to the easy axis of the mother antiferromagnetism. The ac susceptibility measurements demonstrated the fluctuation of the spontaneous magnetization up to 13 K. A model of charge-ordered ferrimagnetism is proposed in order to explain these results. This model explains the spontaneous magnetization which commonly appears in conducting salts of [Fe(Pc)(CN)2] and their derivatives.
Rights: ©2009 The American Physical Society
Type: article
URI: http://hdl.handle.net/2115/39046
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 稲辺 保

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