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High pressure investigation of an organic three-dimensional Dirac semimetal candidate having a diamond lattice

机译：具有钻石晶格的有机三维Dirac半候选的高压研究

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摘要

(ET)Ag_4(CN)_5 [ET = BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene] is a rare example of organic conductors that crystallizes in a diamond structure due to the tetrahedral arrangement of neighboring ET molecules. Because each ET has a +1 site charge, the band is half filled, which in combination with strong Coulomb interactions, turn (ET)Ag_4(CN)_5 into a Mott insulator. Recently, it was realized that this material may realize a nodal Dirac semimetal with a diamondlike lattice, whose state can be induced by suppressing the strong electron correlations. In this report, we present high pressure transport and optical studies on (ET)Ag_4(CN)_5. Our transport study indicates that the activation energy is highly suppressed by the application of hydrostatic pressure. At high pressures, the system varies from activated behavior into Coulomb gap variable range hopping.
机译：（et）Ag_4（CN）_5 [ET =卧TTF：双（乙基乙基噻嗪）四渐少瓦乙烯]是由于相邻ET分子的四面体布置，在金刚石结构中结晶的有机导体的难以使用。因为每个ET具有+1个网站充电，频段是半填充的，这与强的库仑相互作用相结合，转向（et）ag_4（cn）_5进入Mott绝缘体。最近，意识到该材料可以通过抑制强电子相关性来实现具有金刚石状晶格的节点Dirac半型。在本报告中，我们呈现高压传输和光学研究（ET）AG_4（CN）_5。我们的运输研究表明，通过静压压力的应用，活化能量高度抑制。在高压下，系统变化到Coulomb间隙可变范围跳跃中的激活行为。

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  • 来源
    《Physical review》 |2020年第24期|245124.1-245124.7|共7页
  • 作者

    Andhika Kiswandhi; Mitsuhiko Maesato; Shinya Tomeno; Yukihiro Yoshida; Yasuhiro Shimizu; Prashant Shahi; Jun Gouchi; Yoshiya Uwatoko; Gunzi Saito; Hiroshi Kitagawa;

  • 作者单位

    Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho Sakyo-ku Kyoto 606-8502 Japan;

    Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho Sakyo-ku Kyoto 606-8502 Japan;

    Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho Sakyo-ku Kyoto 606-8502 Japan;

    Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho Sakyo-ku Kyoto 606-8502 Japan;

    Department of Physics Nagoya University Furo-cho Chikusa-ku Nagoya 464-8602 Japan;

    Institute for Solid State Physics The University of Tokyo Kashiwanoha Kashiwa Chiba 277-8581 Japan;

    Institute for Solid State Physics The University of Tokyo Kashiwanoha Kashiwa Chiba 277-8581 Japan;

    Institute for Solid State Physics The University of Tokyo Kashiwanoha Kashiwa Chiba 277-8581 Japan;

    Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho Sakyo-ku Kyoto 606-8502 Japan;

    Division of Chemistry Graduate School of Science Kyoto University Kitashirakawa-Oiwakecho Sakyo-ku Kyoto 606-8502 Japan;

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