Strange metal from a frustration-driven charge order instability
Strange metal from a frustration-driven charge order instability
复制标题
DOI：
10.1038/s41563-019-0284-9
复制
发表时间：
2019-02
期刊：
影响因子：
41.2
通讯作者：
Toshihiro Sato;K. Kitai;Kazuya Miyagawa;Masafumi Tamura;Akira Ueda;Hatsumi Mori;K. Kanoda
中科院分区：
文献类型：
--
作者：
Toshihiro Sato;K. Kitai;Kazuya Miyagawa;Masafumi Tamura;Akira Ueda;Hatsumi Mori;K. Kanoda
粒子间的相互作用是自冲突的，而不是合作的特定晶格。当这种几何挫折发生时，电荷有序（CO）可以不稳定成非平凡的电荷状态，如最近观察到的电荷玻璃（CG）。一个更极端的情况是理论上提出的CO的挫挫诱导的量子熔化。在这里，我们报告直流电荷传输和噪声光谱测量的三角晶格有机导体位于靠近CO或CG。我们的实验表明，这些材料可以托管一个奇怪的金属与不寻常的电荷动力学，我们归因于挫折引起的波动的CO或CG。我们的研究结果还表明，当施加单轴应力时，反常电荷涨落可以冻结成绝缘状态，从而减少了几何挫折。目前的观察表明，存在类似于自旋液体的挫折感生的量子熔化的电荷。
Interparticle interactions are self-conflicting rather than cooperative on particular lattices. When such geometrical frustration occurs, charge ordering (CO) can be destabilized into non-trivial charge states such as the recently observed charge glass (CG). A more extreme case is the frustration-induced quantum melting of the CO that has been theoretically proposed. Here, we report d.c. charge transport and noise spectroscopy measurements for a triangular-lattice organic conductor situated close to the CO or CG. Our experiments demonstrate that these materials can host a strange metal with unusual charge dynamics, which we attribute to frustration-induced fluctuations of the CO or CG. Our results also show that the anomalous charge fluctuations can freeze into an insulating state when uniaxial stress is applied, which reduces the geometrical frustration. The present observations suggest the existence of the frustration-induced quantum melting of charges analogous to spin liquids.