Mechanism of Superconductivity in Two-Dimensional Organic Conductors

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  • 二次元有機導体の超伝導発現機構
  • ニジゲン ユウキ ドウタイ ノ チョウデンドウ ハツゲン キコウ

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Abstract

<p>In the family of quasi-two-dimensional organic conductors κ-(ET)2 X, superconductivity (SC) is observed next to the so-called dimer-Mott insulator. To clarify the mechanism of SC, we study the extended Hubbard model using the variational Monte Carlo method. We show the ground state phase diagram that includes the antiferromagnetic dimer-Mott insulator, several charge-ordered states, and SC. The symmetry of SC is an extended-s+dx2-y2-wave type and is different from the one discussed in cuprate high-temperature superconductors. We also find significant electron-hole asymmetry and change of the symmetry of SC by carrier doping. Our results suggest the importance of the charge fluctuation and geometrical frustration, and provide new perspective to the mechanism of SC in organic conductors.</p>

Journal

  • Butsuri

    Butsuri 75 (10), 625-630, 2020-10-05

    The Physical Society of Japan

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