Sato Takuro, Miyagawa Kazuya, Tamura Masafumi, Kanoda Kazushi
Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan.
Phys Rev Lett. 2020 Oct 2;125(14):146601. doi: 10.1103/PhysRevLett.125.146601.
To get insight into the nature of the electronic fluid in the frustration-driven charge glasses, we investigate in-plane and out-of-plane charge transport for several quasitriangular-lattice organic systems: θ-(BEDT-TTF){2}X [X=RbZn(SCN){4}, CsZn(SCN){4}, and I{3}]. These compounds host a charge order, charge glass, and Fermi liquid, depending on the strength of the charge frustration. We find that the resistivity exhibits extreme 2D anisotropy and contrasting temperature dependence between the in-plane and out-of-plane directions in the charge-glass phase, unlike in the charge order and metallic states. The experimental features indicate that the frustration-induced charge glass carries an anomalous 2D-confined electronic fluid with possible charge excitations other than conventional quasiparticles.
为深入了解受挫驱动电荷玻璃中电子流体的本质，我们研究了几种准三角形晶格有机体系：θ-(BEDT-TTF)₂X [X = RbZn(SCN)₄、CsZn(SCN)₄ 和 I₃] 的面内和面外电荷传输。这些化合物根据电荷受挫的强度呈现出电荷有序、电荷玻璃和费米液体状态。我们发现，与电荷有序和金属态不同，在电荷玻璃相中，电阻率表现出极端的二维各向异性以及面内和面外方向之间截然不同的温度依赖性。实验特征表明，受挫诱导的电荷玻璃携带一种异常的二维受限电子流体，可能存在除传统准粒子之外的电荷激发。
