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Evidence for the formation of a Mott state in potassium-intercalated pentacene

机译:在插钾钾并五苯中形成莫特态的证据

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摘要

We investigate electronic transport through pentacene thin films intercalated with potassium. From temperature-dependent conductivity measurements we find that potassium-intercalated pentacene shows metallic behavior in a broad range of potassium concentrations. Surprisingly, the conductivity exhibits a re-entrance into an insulating state when the potassium concentration is increased past one atom per molecule. We analyze our observations theoretically by means of electronic structure calculations, and we conclude that the phenomenon originates from a Mott metal-insulator transition, driven by electron-electron interactions.
机译:我们调查了通过并五苯薄膜嵌入钾的电子传输。从与温度有关的电导率测量结果中,我们发现,插钾的并五苯在宽范围的钾浓度下均表现出金属行为。出人意料的是,当钾浓度增加到每分子一个原子以上时,电导率会再次进入绝缘状态。我们通过电子结构计算从理论上分析了我们的观察结果,并得出结论,该现象起源于由电子-电子相互作用驱动的莫特金属-绝缘体跃迁。

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  • 来源
    《Physical review》 |2009年第12期|221-228|共8页
  • 作者单位

    Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan;

    Institute Lorentz for Theoretical Physics, Leiden University, 2300 RA Leiden, The Netherlands Faculty of Science and Technology and MESA + Institute for Nanotechnologv, University of Twente, 7500 AE Enschede, The Netherlands;

    Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands;

    Faculty of Science and Technology and. MESA + Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands;

    Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands DPMC and GAP, University of Geneva, quai Ernest-Ansermet 24, CH-1211 Geneva 4, Switzerland;

    Institute Lorentz for Theoretical Physics, Leiden University, 2300 RA Leiden, The Netherlands Institute for Molecules and Materials, Radboud University, 6500 GL Nijmegen, The Netherlands Stanford Institute for Materials and Energy Sciences, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polymers; organic compounds; fullerenes and related materials; intercalation compounds; metal-insulator transitions and other electronic transitions;

    机译:聚合物有机化合物;富勒烯及相关物质;插层化合物;金属绝缘体过渡和其他电子过渡;

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