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Pressure-temperature phase diagram of a charge-ordered organic conductor studied by ~(13)C NMR

机译:用〜(13)C NMR研究带电有机导体的压力-温度相图

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摘要

We performed ~(13)C NMR measurements on the quasi-one-dimensional (Q1D) charge-ordered system (DI-DCNQI)_2 Ag under ambient and applied pressure to clarify the pressure-temperature phase diagram. For pressures up to 15 kbar, the NMR spectra exhibit complicated splitting at low temperatures, indicating a "generalized 3D Wigner crystal" state. In this pressure region, we find that increased pressure causes a decrease in the charge disproportionation ratio, along with a decrease in the transition temperature of the generalized 3D Wigner crystal. In the high-pressure region, near 20 kbar, where a 1D confined liquid crosses over to a 3D Fermi liquid at high temperatures, the ground state is replaced by a nonmagnetic insulating state that is qualitatively different from the generalized 3D Wigner crystal.
机译:我们在环境压力和施加压力下对准一维(Q1D)电荷有序系统(DI-DCNQI)_2 Ag进行了〜(13)C NMR测量,以阐明压力-温度相图。对于高达15 kbar的压力,NMR光谱在低温下显示出复杂的分裂,表明“广义3D Wigner晶体”状态。在此压力区域中,我们发现压力升高会导致电荷歧化比降低,而广义3D Wigner晶体的转变温度也会降低。在20 kbar附近的高压区域,在高温下1D受限液体与3D费米液体相交,基态被定性不同于一般3D Wigner晶体的非磁性绝缘态所取代。

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  • 来源
    《Physical review》 |2014年第4期|045126.1-045126.7|共7页
  • 作者单位

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Universite of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan,Department of Applied Physics, Tokyo Universite of Science, Katsushika-ku, Tokyo 125-8585, Japan;

    Department of Applied Physics, Universite of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Department of Applied Physics, Universite of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Department of Applied Physics, Universite of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Department of Physics, Gakushuin Universite, Toshima-ku, Tokyo 171-8588, Japan;

    Department of Physics, Gakushuin Universite, Toshima-ku, Tokyo 171-8588, Japan;

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

    metal-insulator transitions and other electronic transitions; polymers and organic compounds; nuclear magnetic resonance and relaxation;

    机译:金属-绝缘体过渡和其他电子过渡;聚合物和有机化合物;核磁共振与弛豫;

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