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arXiv 1606.09291cond-mat.str-el
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稀土镍酸盐薄膜和异质结构的物理

Physics of ultrathin films and heterostructures of rare earth nickelates

S. Middey, J. Chakhalian, P. Mahadevan, J. W. Freeland, A. J. Millis, D. D. Sarma

摘要:

具有关联电子的过渡金属氧化物的电子结构可以在Zaanen-Sawatzky-Allen框架内合理化。在简要描述了目前的电子行为的范例,我们专注于物理学的稀土镍酸盐作为一个原型的复杂性内出现的电荷转移制度。通过异质结构实现高$T_c$铜酸盐的物理学的有趣前景导致了大量的努力以超薄形式外延稳定这些材料。由于外延应变、量子限制和界面电荷转移的影响,在这种人工结构中出现了大量的新现象。本文综述了人工稀土镍酸盐的研究现状,试图揭示其电、磁行为与晶体结构之间的内在联系。最后,我们讨论了未来的方向,以解开有关起源的金属-绝缘体过渡,氧空穴的作用,和真正的性质的反铁磁自旋配置在超薄极限的难题。

英文摘要:

The electronic structure of transition metal oxides featuring correlated electrons can be rationalized within the Zaanen-Sawatzky-Allen framework. Following a brief description of the present paradigms of electronic behavior, we focus on the physics of rare earth nickelates as an archetype of complexity emerging within the charge transfer regime. The intriguing prospect of realizing the physics of high $T_c$ cuprates through heterostructuring resulted in a massive endeavor to epitaxially stabilize these materials in ultra-thin form. A plethora of new phenomena unfolded in such artificial structures due to the effect of epitaxial strain, quantum confinement, and interfacial charge transfer. Here we review the present status of artificial rare-earth nickelates in an effort to uncover the interconnection between the electronic and magnetic behavior and the underlying crystal structure. We conclude by discussing future directions to disentangle the puzzle regarding the origin of the metal-insulator transition, the role of oxygen holes, and the true nature of the antiferromagnetic spin configuration in the ultra-thin limit.

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