Competition between strain and dimensionality effects on the electronic phase transitions in NdNiO3 films.,Scientific Reports

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Competition between strain and dimensionality effects on the electronic phase transitions in NdNiO3 films.
Scientific Reports ( IF 3.8 ) Pub Date : 2015-Dec-21 , DOI: 10.1038/srep18707
Le Wang ₁ , Sheng Ju ₂ , Lu You ₁ , Yajun Qi ₃ , Yu-Wei Guo ₁ , Peng Ren ₁ , Yang Zhou ₁ , Junling Wang ₁

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Transition metal oxides host an array of exotic electronic phases, including superconductivity, ferroelectricity, quantum spin liquid and Mott insulators. Their extreme sensitivity to external stimuli enables various routes to manipulate the ground state, which greatly improves our understanding of the physics involved. Here, we report the competition between strain and dimensionality effects on the phase evolution in high quality NdNiO3 films down to several unit cells. While both compressive and tensile strains increase the Ni 3d band width and favor the metallic phase, reducing dimensionality, on the other hand, decreases the covalent band width and favors the insulating phase in NdNiO3. The experimental observations are well supported by ab initio calculations and improve our understanding of the electronic behavior in strongly correlated electron systems.

中文翻译：

应变和维数之间的竞争对 NdNiO3 薄膜中电子相变的影响。

过渡金属氧化物具有一系列奇异的电子相，包括超导性、铁电性、量子自旋液体和莫特绝缘体。它们对外部刺激的极端敏感性使得能够通过多种途径操纵基态，这极大地提高了我们对所涉及物理的理解。在这里，我们报告了应变和维度效应之间的竞争对高质量 NdNiO3 薄膜中直至几个晶胞的相演化的影响。虽然压缩应变和拉伸应变都会增加 Ni 3d 能带宽度并有利于金属相，但另一方面，降低维数会减小共价带宽度并有利于 NdNiO3 中的绝缘相。实验观察得到从头计算的良好支持，并提高了我们对强相关电子系统中电子行为的理解。

更新日期：2015-12-23

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