"Spin-Driven" Crystal Lattice Distortion in Frustrated Magnet CuFeO_2 : Synchrotron X-ray Diffraction Study(Condensed Matter : Structure, Mechanical and Thermal Properties)

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概要

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• We have performed synchrotron radiation X-ray diffraction measurements on a triangular lattice antiferromagnet CuFeO_2, using the single crystal. The crystal lattice symmetry lowers from hexagonal to orthorhombic below the magnetic phase transition (from a partially disordered phase to four-sublattice phase) temperature T_<N2>. In addition, superlattice reflections were observed below T_<N2>; this suggests that the "scalene triangle model" lattice distortion splits the nearest neighbor exchange interaction in the basal plane into three different exchange interactions. This distortion lifts the vast degeneracy of the strongly frustrated spin system, leading to the four-sublattice ground state. Thus we argue that the lattice degree of freedom plays an important role in the stabilization of the four-sublattice ground state in CuFeO_2.

• 社団法人日本物理学会の論文
• 2006-02-15

著者

• MITSUDA Setsuo

  Department of Physics, Faculty of Science, Tokyo University of Science, Tokyo

• Mitsuda Setsuo

  Department Of Physics Faculty Of Science Tokyo University Of Science

• Mitsuda Setsuo

  Department Of Physics Faculty Of Science Science University Of Tokyo

• Terada Noriki

  Department Of Physics Faculty Of Science Tokyo University Of Science

• OHSUMI Hiroyuki

  Japan Synchrotron Radiation Research Institute

• Tajima Keisuke

  Department of Physics,Faculty of Science and Technology,Keio University

• Tajima Keisuke

  Department Of Physics Faculty Of Science And Technology Keio University

• Ohsumi Hiroyuki

  Japan Synchrotron Radiation Res. Inst. Hyogo

• TAJIMA Keisuke

  Department of Applied Chemistry, School of Engineering, The University of Tokyo

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