Unique phase transition on spin-2 triangular lattice of Ag2MnO2

• Yoshida Hiroyuki

  Institute for Solid State Physics, University of Tokyo

• Ahlert Sascha

  Max-Planck-Institut für Festköperforschung

• Jansen Martin

  Max-Planck-Institut für Festköperforschung

• Okamoto Yoshihiko

  Institute for Solid State Physics, University of Tokyo

• Yamaura Jun-Ichi

  Institute for Solid State Physics, University of Tokyo

• Hiroi Zenji

  Institute for Solid State Physics, University of Tokyo

書誌事項

タイトル別名

• Unique Phase Transition on Spin-2 Triangular Lattice of Ag<SUB>2</SUB>MnO<SUB>2</SUB>

抄録

Ag₂MnO₂ is studied as a possible candidate compound for an antiferromagnetic XY spin model on a triangular lattice. In spite of the large Curie–Weiss temperature of −430 K found in magnetic susceptibility, Mn³⁺ spins with S=2 do not undergo a conventional long-range order down to 2 K probably owing to the geometrical frustration and two dimensionality in the system. Instead, a unique phase transition is found at 80 K, where specific heat exhibits a clear sign of a second-order phase transition, while magnetic susceptibility changes smoothly without a distinct anomaly. We think that this transition is related to the chirality degree of freedom associated with a short-range order, which has been expected for the classical XY spin model on a triangular lattice. On further cooling, spin-glass-like behavior is observed below 22 K, possibly corresponding to a quasi-long-range order.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 77 (7), 074719-074719, 2008

  一般社団法人 日本物理学会

キーワード

• triangular lattice
• <I>XY</I> spin
• frustration
• chirality
• Ag<SUB>2</SUB>MnO<SUB>2</SUB>

詳細情報

• CRID: 1390001204197638784
• NII論文ID: 130005436989
• NII論文ID: 110006821329
• NII論文ID: 210000107349
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.77.074719
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 9577166
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9577166
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.77.074719
• 本文言語コード: en
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