Singlet Ground State and Magnetic Interactions in New Spin Dimer System Ba₃Cr₂O₈

• Nakajima Tomohiko

  Materials Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo

• Mitamura Hiroyuki

  Division of Physics under Extreme Conditions, Institute for Solid State Physics, University of Tokyo

• Ueda Yutaka

  Materials Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo

書誌事項

タイトル別名

• Singlet Ground State and Magnetic Interactions in New Spin Dimer System Ba3Cr2O8

抄録

We have successfully synthesized Ba₃Cr₂O₈ and investigated its crystal structure and magnetic properties. The crystal structure consists of Ba²⁺ cations and isolated CrO₄³⁻ tetrahedra; magnetic chromium ions exist as rare Cr⁵⁺ (3d¹, S=1⁄2). An S=1⁄2 compound Ba₃Cr₂O₈ was found to be a three-dimensional quantum spin system with a singlet ground state of dimer origin. From the analysis of magnetic susceptibility and high-field magnetization data, excitation gap is evaluated as Δ⁄k_B=16.1 K and intra- and interdimer exchange interactions are estimated as J₀⁄k_B=25.0 K and J′⁄k_B=7.7 K, respectively. Comparing with a similar spin dimer compound Ba₃Mn₂O₈, Ba₃Cr₂O₈ has a more dominant intradimer interaction.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 75 (5), 054706-, 2006

  一般社団法人 日本物理学会

キーワード

• Ba<SUB>3</SUB>Cr<SUB>2</SUB>O<SUB>8</SUB>
• S=1⁄2 spin singlet
• magnetic property
• high-field magnetization
• excitation gap

詳細情報

• CRID: 1390282679167151744
• NII論文ID: 110004702334
• NII論文ID: 210000106156
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.75.054706
• BIBCODE: 2006JPSJ...75e4706N
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7908371
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7908371
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.054706
• 本文言語コード: en
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