Organic Superconductors Including Polar Molecules in an Insulating Layer

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  • 絶縁層に極性分子をもつ有機超伝導体
  • ゼツエンソウ ニ キョクセイ ブンシ オ モツ ユウキ チョウデンドウタイ

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Abstract

<p>We report structural and electronic properties of molecular layered superconductors including polar molecules in an insulating layer, κH-(DMEDO-TSeF)2[Au(CN)4](THF) and the third polymorph of the organic superconductor (BEDT-TTF)2 Ag(CF3)4(TCE). For the first compound, the angular-dependent magnetoresistance shows incoherent interlayer transport. However, two closed Fermi surfaces are observed in quantum oscillation. This indicates that crystallographically independent layers have different charge densities, i.e. interlayer charge disproportionation, which is due to the electric dipole of THF. For the later compound, the crystal consists of alternating stacks of two types of donor sheets, κ- and α′-types, and the unit cell includes four donor layers. This structure is similar to another high-Tc phase, in which the unit cell contains two donor layers. The superconducting transition temperatures are approximately 11.0 and 9.5 K for the four-layered and two-layered phases, respectively. Superconductivity is attributed to the κ-type conducting layer, because the α′-type layer is in a charge-ordered state. This is in agreement with the de Haas–van Alphen oscillation, which indicates that the κ-layer with an effective half-filled band is the conducting layer. In both superconductors, the superconducting layer is sandwiched by polar insulating layers. This reminds us the Ginzburg superconducting mechanism.</p>

Journal

  • Butsuri

    Butsuri 71 (8), 541-546, 2016

    The Physical Society of Japan

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