Magnetic Torque Experiments on TPP[Fe(Pc)L

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概要

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• We have measured the magnetic torque of TPP[Fe(Pc)Br<inf>2</inf>]<inf>2</inf>and TPP[Fe(Pc)Cl<inf>2</inf>]<inf>2</inf>to clarify their magnetic state, comparing our results with those of formerly performed experiments on TPP[Fe(Pc)CN<inf>2</inf>]<inf>2</inf>. The conductors in this family exhibit giant negative magnetoresistance. We employed the cantilever magnetometry technique with our newly developed calibration method to obtain absolute values of the torque (J/rad Fe mol), enabling the comparison between experimental and calculated results. With decreasing temperature, the antiferromagnetic ordering of the \pi electron is found to occur at {\sim}13 K, and then the antiferromagnetic short-range ordering of the d electron follows at {\sim}8 K in these two salts. Our anisotropic one-dimensional Heisenberg model can explain 1) the susceptibility data quantitatively, 2) the torque curves quantitatively, which were obtained when the magnetic field was rotated in the ac-plane, and 3) the behavior of the d electron in the torque curves qualitatively, which were obtained by rotating the field in the ab-plane. By combining our model with the antiferromagnetic model for the \pi electron, the experimental torque data on TPP[Fe(Pc)Br<inf>2</inf>]<inf>2</inf>and TPP[Fe(Pc)Cl<inf>2</inf>]<inf>2</inf>are satisfactorily described. In addition, we could also successfully obtain the anisotropy energy in the antiferromagnetic state.

• 2013-03-15

著者

• Yu Derrick

  Division Of Chemistry Graduate School Of Science Hokkaido University

• Inabe Tamotsu

  Division Of Chemistry Graduate School Of Science Hokkaido University

• Torizuka Kiyoshi

  Institute For Solid State Physics University Of Tokyo

• Tajima Hiroyuki

  Institute For Solid State Physics The University Of Tokyo

• Matsuda Masaki

  Graduate School Of Science And Technology Kumamoto University

• Naito Toshio

  Division of Chemistry and Biology, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan

• Hanasaki Noriaki

  Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

• Inoue Munenori

  Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan

• Naito Toshio

  Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan

• Inabe Tamotsu

  Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan

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