Successive phase transitions of LuBaCo4O7 with kagome and triangular lattices

• Soda Minoru

  Department of Physics, Division of Material Science, Nagoya University

• Moyoshi Taketo

  Department of Physics, Division of Material Science, Nagoya University

• Yasui Yukio

  Department of Physics, Division of Material Science, Nagoya University

• Sato Masatoshi

  Department of Physics, Division of Material Science, Nagoya University

• Kakurai Kazuhisa

  Quantum Beam Science Directorate, Japan Atomic Energy Agency

書誌事項

タイトル別名

• Successive Phase Transitions of LuBaCo<SUB>4</SUB>O<SUB>7</SUB> with Kagome and Triangular Lattices

抄録

Magnetic, thermal and neutron diffraction measurements have been carried out on single-crystal samples of LuBaCo₄O₇ with kagome and triangular lattices of Co spins. Anomalies of the magnetic susceptibility have been found at temperatures T_a1∼70 K and T_a2∼50 K. We have also found a second-order structural transition at T_c1∼165 K and a first-order structural transition at T_c2∼105 K (T_c2′∼80 K) with increasing (decreasing) temperature. Two groups of magnetic diffuse scattering, corresponding to the short-range correlations with the commensurate (C) and incommensurate (IC) periods, have been found to exist below the structural transition temperature T_c2 (T_c2′). The reflections with the C and IC periods originate from the moments on the kagome and triangular lattices, respectively. At 10 K, the magnetic correlation length is estimated to be ∼100 Å. The structural changes of LuBaCo₄O₇ and YBaCo₄O₇ differ significantly, which seems to induce the differences in their magnetic properties.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 76 (8), 084701-084701, 2007

  一般社団法人 日本物理学会

キーワード

• LuBaCo<SUB>4</SUB>O<SUB>7</SUB>
• geometrical frustration
• successive phase transitions
• neutron diffraction
• Co oxides

詳細情報

• CRID: 1390001204196429184
• NII論文ID: 130005296947
• NII論文ID: 110006366850
• NII論文ID: 210000106838
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.76.084701
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 8863619
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8863619
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.76.084701
• 本文言語コード: en
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