X-Ray and Neutron Diffraction Study of Crystal Structure and Spin Arrangement of the Distorted-Triangular-Lattice Antiferromagnet RbMnBr_a
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概要
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Single-crystal X-ray and neutron diffraction study of the distorted-triangular-lattice antiferromagnet RbMnBr_3 was carried out in order to clarify the crystal structure below T_4∿222K (phase V) and to find the origin of spin arrangement below TN=8.5K. The phase-V diffraction pattern showed some systematic and accidental extinction of possible reflections with triple-domain formation. An orthorhombic structure of a space group symmetry Pbca with a unit cell 2a_0×√<3>a_0×C_0(Z=8) was proposed. The triangular lattice of Mn^<2+>ions is distorted in a novel form, coined as a zigzag-row model. Spin arrangement of this model was deduced using the mean-field theory. Spin structures of RbMnBr_3 in the incommensurately modulated LT (low-field triangular) and the commensurately modulated HT (high-field triangular) phases are described.
- 社団法人日本物理学会の論文
- 2002-01-15
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