Observation of Metal–Insulator Transition in Hollandite Vanadate, K₂V₈O₁₆

• Isobe Masahiko

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

• Koishi Shigenori

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

• Kouno Naomi

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

• Yamaura Jun-Ichi

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

• Yamauchi Touru

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

• Ueda Hiroaki

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

• Gotou Hirotada

  Division of New Materials Science, Institute for Solid State Physics, University of Tokyo

• Yagi Takehiko

  Division of New Materials Science, 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

• Observation of Metal–Insulator Transition in Hollandite Vanadate, K2V8O16

抄録

We have synthesized hollandite vanadate, K₂V₈O₁₆, by a solid-state reaction under 4 GPa at 1473 K for one hour, and investigated its structural and electromagnetic properties. We found a metal–insulator transition with a two-step jump of resistivity of about three orders at around 170 K. The magnetic susceptibility is reduced to a small value at the transition, suggesting the formation of V⁴⁺–V⁴⁺ singlet pairs and V³⁺–V³⁺ pairs in the low-temperature insulator phase. The transition is of first order accompanied by a structural change from a tetragonal to a monoclinic structure. The low-temperature phase has a superlattice of \\sqrt2a×\\sqrt2a×2c, where a and c denote the parameters of the primitive cell for the simple tetragonal hollandite structure, suggesting a charge ordering of V⁴⁺ and V³⁺. We construct a possible charge order model from the obtained results, in which two kinds of double-chain formed by V³⁺ and V⁴⁺ chains and by single V⁴⁺ chains order in a manner that gives a superlattice of \\sqrt2×\\sqrt2 in the a–b plane. The V⁴⁺–V⁴⁺ and V³⁺–V³⁺ pairs are formed in each chain along the c-axis, resulting in a duplication of the c-axis.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 75 (7), 073801-, 2006

  一般社団法人 日本物理学会

キーワード

• K<SUB>2</SUB>V<SUB>8</SUB>O<SUB>16</SUB>
• metal–insulator transition
• magnetic susceptibility
• structural transition

詳細情報

• CRID: 1390282679166228352
• NII論文ID: 110004777966
• NII論文ID: 210000106219
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.75.073801
• BIBCODE: 2006JPSJ...75g3801I
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7973732
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7973732
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.073801
• 本文言語コード: en
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