Phase Competition and Superconductivity in κ-(BEDT-TTF)2X: Importance of Intermolecular Coulomb Interactions
Phase Competition and Superconductivity in κ-(BEDT-TTF)2X: Importance of Intermolecular Coulomb Interactions
复制标题
κ-(BEDT-TTF)2X 中的相竞争和超导性：分子间库仑相互作用的重要性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. Yunoki
中科院分区：
文献类型：
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作者：
Hiroshi Watanabe;H. Seo;S. Yunoki
从理论上研究了分子导体κ-（BEDT-TTF）2X中不同电子相之间的竞争.用变分Monte Carlo方法研究了具有κ型几何的3/4填充扩展Hubbard模型的基态性质.我们发现了各种相互竞争的相：二聚-莫特绝缘体、极性电荷有序绝缘体、三重电荷有序金属和超导体，它们的配对对称性是“扩展-（s + d_{x^{2} - y^{2}}）"波型。我们的研究结果表明，超导相是稳定的莫特金属-绝缘体转变的边缘，但附近的电荷顺序不稳定性，清楚地表明的重要性，内二聚体电荷自由度和分子间的库仑相互作用，超越了简单的描述的半填充哈伯德模型。
We theoretically study the competition among different electronic phases in molecular conductors κ-(BEDT-TTF)2X. The ground-state properties of a 3/4-filled extended Hubbard model with the κ-type geometry are investigated by a variational Monte Carlo method. We find various competing phases: dimer-Mott insulator, polar charge-ordered insulator, 3-fold charge-ordered metal, and superconductivity, whose pairing symmetry is an “extended-(s + d_{x^{2} - y^{2}})”-wave type. Our results show that the superconducting phase is stabilized not on the verge of the Mott metal–insulator transition but near charge order instabilities, clearly indicating the importance of the intradimer charge degree of freedom and the intermolecular Coulomb interactions, beyond the simple description of the half-filled Hubbard model.
影响因子：
8.6
作者：
D. Guterding;Sandra Diehl;M. Altmeyer;T. Methfessel;U. Tutsch;H. Schubert;M. Lang;J. Müller;M. Huth;H. Jeschke;R. Valentí;M. Jourdan;H. Elmers
通讯作者：
D. Guterding;Sandra Diehl;M. Altmeyer;T. Methfessel;U. Tutsch;H. Schubert;M. Lang;J. Müller;M. Huth;H. Jeschke;R. Valentí;M. Jourdan;H. Elmers