Antiferromagnetic Ordering in the Conducting π-d System κ-(BEDT-TSF)_2FeCl_4 (where BEDT-TSF is Bis (ethylenedithio) tetraselenafulvalene, C_<10>S_4Se_4H_8) : Condensed Matter: Electronic Properties, etc.

概要

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To study the magnetic ground state in the title compound of a quasi two-dimensional charge transfer salt containing Fe<3+> (S = 5/2) paramagnetic ions, we have measured the magnetic torque at 0.4 K <_- T <_- 4 K and H <_- 14 T using a capacitive cantilever torque meter. The torque and magnetization data above 1 K are well scaled by the Brillouin plot with a Weiss temperature of -0.8 K. From theoretical analysis for a uniaxial antiferromagnet, anomalous torque curves below I K reveal that an antiferromagnetic ordering with its easy axis perpendicular to the conducting a,c-plane occurs between 0.5 K and 1 K. This antiferromagnetic order coexists with the metallic state of π-electrons, indicating quite weak π-d interaction.
社団法人日本物理学会の論文
2000-09-15