发表机构
Universität Stuttgart; Saitama University; RIKEN Nishina Center; Shibaura Institute of Technology; University of Tokyo; Max Planck Institute for Solid State Research; Institut Néel - CNRS and Université Grenoble Alpes(斯图加特大学; 埼玉大学; 理化学研究所西村研究中心; 芝浦工业大学; 东京大学; 马克斯·普朗克固体研究所; 内耳研究所-法国国家科学研究中心与格勒诺布尔阿尔卑斯大学)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
研究发现含Hg阴离子空间调制的κ-(BEDT-TTF)₄Hg₃-δX₈具有奇异金属行为,其响应仅出现在非公度阴离子层系统中,结论可推广至其他强关联奇异金属化合物。
AI 中文摘要
κ-BEDT-TTF盐是典型的莫特系统,实现了由关联驱动的从费米液体态到莫特绝缘体的电子转变。然而,含Hg阴离子空间调制的金属化合物κ-(BEDT-TTF)₄Hg₃-δX₈(X=Br、Cl)不属于该分类。我们的温度依赖输运及宽频光学研究显示,其电阻率ρ(T)在高温下满足ρ(T)∝T的依赖关系,频率依赖电导率满足|σ̂(ω)|∝ω⁻⁰·⁷的幂律行为,这是“奇异金属”的著名特征。这些奇异金属的线性频率散射率符合普朗克耗散标度。我们证明该响应仅出现在具有非公度阴离子层的系统中,并建立了其与大尺度空间调制的直接关联。我们的结论可推广至其他强关联奇异金属化合物。
英文摘要
The $κ$-BEDT-TTF salts are prototypical Mott systems, realizing a correlation-driven electronic transition from a Fermi-liquid state to a Mott insulator. The metallic compounds with spatially modulated Hg-containing anions, $κ$-(BEDT-TTF)$_4$Hg$_{3-δ}X_8$ ($X$ = Br, and Cl), however, fall outside this classification. Our temperature-dependent transport and broad-range optical investigations reveal a $ρ(T)\propto T$ dependence of the resistivity up to elevated temperatures and a power-law behavior of the frequency-dependent conductivity $\vert\hatσ (ω)\vert \propto ω^{-0.7}$; well-known hallmarks of ``strange metals''. The linear-in-frequency scattering rate of these strange metals scales to the Planckian dissipation. We demonstrate that this response only occurs in systems with incommensurate anion layers and establish a direct link to large-scale spatial modulations. Our conclusions can be extended to other strongly correlated strange-metal compounds
Comments7 Pages (3 Figures) + Supplementary