PrVO $_3$薄膜的机械应变工程磁性剪裁
Magnetism tailored by mechanical strain engineering in PrVO$_3$ thin films
摘要：
具有ABO $_3$钙钛矿结构的过渡金属氧化物表现出强烈的纠缠结构和电子自由度，因此，人们期望通过各种外部刺激作用于晶格来揭示奇异的相和性质。以Jahn-Teller活性钒酸盐PrPDMATHABMN V $^{3+}$ O $_3$化合物为模型体系，研究了PrVO $_3$ Néel温度T $_N$作为薄膜生长时相对于体相可提高40 K.使用先进的实验技术，这种增强是明确归因于所经历的薄膜的外延压缩应变所产生的四方性。第一性原理模拟不仅证实了实验结果，但他们也揭示了应变促进了前所未有的轨道有序的V $^{3+}$ d电子，强烈有利于反铁磁相互作用。这些结果表明，准确控制结构方面是揭示氧化物中意外相的关键。
英文摘要：
Transition-metal oxides with an ABO$_3$ perovskite structure exhibit strongly entangled structural and electronic degrees of freedom and thus, one expects to unveil exotic phases and properties by acting on the lattice through various external stimuli. Using the Jahn-Teller active praseodymium vanadate Pr$^{3+}$V$^{3+}$O$_3$ compound as a model system, we show that PrVO$_3$ Néel temperature T$_N$ can be raised by 40 K with respect to the bulk when grown as thin films. Using advanced experimental techniques, this enhancement is unambiguously ascribed to a tetragonality resulting from the epitaxial compressive strain experienced by the films. First-principles simulations not only confirm experimental results, but they also reveal that the strain promotes an unprecedented orbital-ordering of the V$^{3+}$ d electrons, strongly favouring antiferromagnetic interactions. These results show that an accurate control of structural aspects is the key for unveiling unexpected phases in oxides.
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