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Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition
npj Quantum Materials ( IF 5.7 ) Pub Date : 2021-01-27 , DOI: 10.1038/s41535-020-00307-0
A. Pustogow , R. Rösslhuber , Y. Tan , E. Uykur , A. Böhme , M. Wenzel , Y. Saito , A. Löhle , R. Hübner , A. Kawamoto , J. A. Schlueter , V. Dobrosavljević , M. Dressel

Coulomb repulsion among conduction electrons in solids hinders their motion and leads to a rise in resistivity. A regime of electronic phase separation is expected at the first-order phase transition between a correlated metal and a paramagnetic Mott insulator, but remains unexplored experimentally as well as theoretically nearby T = 0. We approach this issue by assessing the complex permittivity via dielectric spectroscopy, which provides vivid mapping of the Mott transition and deep insight into its microscopic nature. Our experiments utilizing both physical pressure and chemical substitution consistently reveal a strong enhancement of the quasi-static dielectric constant ε1 when correlations are tuned through the critical value. All experimental trends are captured by dynamical mean-field theory of the single-band Hubbard model supplemented by percolation theory. Our findings suggest a similar ’dielectric catastrophe’ in many other correlated materials and explain previous observations that were assigned to multiferroicity or ferroelectricity.



中文翻译:

莫特绝缘子-金属跃迁处的电子相分离引起的低温介电异常

固体中导电电子之间的库仑排斥会阻碍其运动,并导致电阻率升高。在相关金属和顺磁Mott绝缘体之间的一阶相变处,预计会发生电子相分离,但是在实验以及理论上T  = 0附近仍未得到探索。我们通过介电谱评估复介电常数来解决这个问题。 ,它提供了Mott过渡的生动映射,并深入了解了其微观性质。我们利用物理压力和化学替代实验揭示一致的准静态介电常数的有力的提升ε 1通过临界值调整相关性时。所有实验趋势均由单频带Hubbard模型的动态平均场理论和渗流理论补充。我们的发现表明,在许多其他相关材料中也存在类似的“介电灾难”,并解释了以前分配给多铁性或铁电性的观察结果。

更新日期:2021-01-27
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