Pressure-induced Crossover from Variable Range Hopping to Electron–Electron Interaction in the Organic Conductor (DOET)₂BF₄

• Yasuzuka Syuma

  Department of Material Science, Graduate School of Science, Osaka City University

• Murata Keizo

  Department of Material Science, Graduate School of Science, Osaka City University

• Shimotori Masahiro

  Department of Material Science, Graduate School of Science, Osaka City University

• Fujimoto Tsutomu

  Department of Material Science, Graduate School of Science, Osaka City University

• Yamada Jun-ichi

  Department of Material Science, Graduate School of Material Science, University of Hyogo

• Kikuchi Koichi

  Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University

書誌事項

タイトル別名

• Pressure-induced Crossover from Variable Range Hopping to Electron–Electron Interaction in the Organic Conductor (DOET)2BF4

抄録

This paper reports the pressure effect on resistivity in the quasi two-dimensional (2D) organic conductor (DOET)₂BF₄ with orientational disorder of BF₄ anions. At ambient pressure, the resistivity shows metal–insulator transition at 80 K and 2D variable range hopping (VRH) conduction below 80 K. The insulating behavior is suppressed by applying pressure and the temperature dependence of the resistivity shows the crossover from the 2D VRH to the logarithmic divergence as applied pressure increases. From the observation of the positive magnetoresistance, the logarithmic divergence of the resistivity is not attributed to the Anderson localization, but to the effect of the electron–electron interaction. This crossover is simply understood in terms of the screening effect on the random potential by increase of bandwidth due to applied pressure. It is found that a value of sheet conductance at low temperatures above 8 kbar, where the insulating state is almost suppressed, approaches to the minimum conductivity for a metallic state, σ_min=e²⁄h=1⁄(25.8kΩ), first proposed by Mott.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 75 (2), 024701-, 2006

  一般社団法人 日本物理学会

キーワード

• (DOET)<SUB>2</SUB>BF<SUB>4</SUB>
• 2D organic conductor
• metal–insulator transition
• variable range hopping
• Anderson localization
• electron–electron interaction
• disorder
• pressure
• magnetoresistance

詳細情報

• CRID: 1390282679165525504
• NII論文ID: 110004086877
• NII論文ID: 210000106006
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.75.024701
• BIBCODE: 2006JPSJ...75b4701Y
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7813236
• Web Site: http://id.ndl.go.jp/bib/7813236
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7813236
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.024701
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
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