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Synthesis and physical properties of metal-doped picene solids

机译:掺杂金属的pic烯固体的合成与物理性质

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摘要

We report electronic-structure and physical properties of metal-doped picene as well as selective synthesis of the phase that exhibits 18-K superconducting transition. First, Raman scattering is used to characterize the number of electrons transferred from the dopants to picene molecules, where a softening of Raman scattering peaks enables us to determine the number of transferred electrons. From this, we have identified that three electrons are transferred to each picene molecule in the superconducting doped picene solids. Second, we report pressure dependence of T_c in 7- and 18-K phases of K_3 picene. The 7-K phase shows a negative pressure dependence, while the 18-K phase exhibits a positive pressure dependence which can not be understood with a simple phonon mechanism of BCS superconductivity. Third, we report a synthesis method for superconducting K_3 picene by a solution process with monomethylamine CH_3NH_2. This method enables us to prepare selectively the K_3 picene sample exhibiting 18-K superconducting transition. The method for preparing K_3 picene with T_c = 18 K found here may facilitate clarification of the mechanism of superconductivity.
机译:我们报告了金属掺杂的pic烯的电子结构和物理性质,以及表现出18-K超导转变的相的选择性合成。首先,拉曼散射用于表征从掺杂剂转移到皮烯分子的电子数量,其中拉曼散射峰的软化使我们能够确定转移的电子数量。由此,我们已经确定,三个电子被转移到超导掺杂的picene固体中的每个picene分子上。其次,我们报告了K_3 pic烯在7和18-K相中T_c的压力依赖性。 7-K相显示负压依赖性,而18-K相显示正压依赖性,这是BCS超导的简单声子机理无法理解的。第三,我们报告了一种通过单甲胺CH_3NH_2的溶液化方法超导K_3 pic烯的合成方法。该方法使我们能够选择性地制备表现出18-K超导跃迁的K_3 ene烯样品。此处发现的T_c = 18 K的K_3 picene的制备方法可能有助于澄清超导机理。

著录项

  • 来源
    《Physical review》 |2012年第21期|214507.1-214507.9|共9页
  • 作者单位

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Okayama 700-8530, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan,Research Centre of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan;

    Institute for Innovative Science and Technology, Graduate School of Engineering, Nagasaki Institute of Applied Science, Nagasaki 851-0121, Japan;

    Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198, Japan;

    Department of Physics, The University of Tokyo, Hongo, Tokyo 113-0033, Japan;

    Department of Physics, The University of Tokyo, Hongo, Tokyo 113-0033, Japan;

    Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan,Research Centre of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

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  • 正文语种 eng
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  • 关键词

    fullerenes and related materials; organic superconductors;

    机译:富勒烯及相关材料;有机超导体;

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