Successive Magnetic Phase Transitions in α-Tb_2S_3 Studied by Neutron Diffraction Technique(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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Neutron diffraction measurements on a powder sample of α-Tb_2S_3 were performed. This material consists of a stacking of square lattice Tbl and triangular lattice Tb2 planes and exhibits two magnetic phase transitions at 〜3.5 and 〜12K. It was found that the Tb1 and Tb2 moments behave quite independently. The Tb1 moments show a collinear antiferromagnetic ordering at 〜12K with the magnetic unit cell same as the chemical one. On the other hand, the Tb2 moments start to order at 〜3.5K without affecting the magnetic order of the Tb1 moments. The magnetic structure is noncollinear with a magnetic unit cell double of the chemical one along the α- and c-axes. The ordered moments of the Tb1 and Tb2 moments are 〜8μ_B, similar to the full moment for the free Tb^<3+> ion. These results indicate that the Tb1 and Tb2 moments are completely decoupled due to an orbital contribution, which probably gives rise to a noncollinear structure in the triangular lattice plane. The results are discussed in comparison with those of the related system α-Gd_2S_3, which has no orbital degree of freedom.
- 2006-07-15
著者
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EBISU Shuji
Department of Materials Science and Engineering, Muroran Institute of Technology
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NAGATA Shoichi
Department of Materials Science and Engineering, Muroran Institute of Technology
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Ebisu Shuji
Department Of Materials Science And Engineering Muroran Institute Of Technology
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Ebisu Shuji
Department Of Applied Materials Science Muroran Institute Of Technology
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Nagata Shoichi
Department Of Materials Science And Engineering Muroran Institute Of Technology
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Nagata Shoichi
Muroran Inst. Technol. Hokkaido Jpn
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MATSUDA Masaaki
Quantum Beam Science Directorate, Japan Atomic Energy Agency
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KAKURAI Kazuhisa
Quantum Beam Science Directorate, Japan Atomic Energy Agency
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Nagata Shoichi
Department Of Applied Material Science Muroran Institute Of Technology
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Kakurai Kazuhisa
Quantum Beam Science Directorate Japan Atomic Energy Agency
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Matsuda Masaaki
Quantum Beam Science Directorate Japan Atomic Energy Agency
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Suzuki Takashi
Department Of Anatomic Pathology Tohoku University School Of Medicine
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