In correlated systems, intermediate states usually appear transiently across phase transitions even at the femtosecond scale. It therefore remains an open question how to determine these intermediate states-a critical issue for understanding the origin of their correlated behaviour. Here we report a surface coordination route to successfully stabilize and directly image an intermediate state in the metal-insulator transition of vanadium dioxide. As a prototype metal-insulator transition material, we capture an unusual metal-like monoclinic phase at room temperature that has long been predicted. Coordinate bonding of L-ascorbic acid molecules with vanadium dioxide nanobeams induces charge-carrier density reorganization and stabilizes metallic monoclinic vanadium dioxide, unravelling orbital-selective Mott correlation for gap opening of the vanadium dioxide metal-insulator transition. Our study contributes to completing phase-evolution pathways in the metal-insulator transition process, and we anticipate that coordination chemistry may be a powerful tool for engineering properties of low-dimensional correlated solids.

译文

:在相关系统中,即使在飞秒级,中间状态通常也会在相变之间短暂出现。因此,如何确定这些中间状态仍然是一个悬而未决的问题,这是理解它们相关行为起源的关键问题。在这里,我们报告了一种表面配位路径,该路径可以成功稳定并直接成像二氧化钒的金属-绝缘体过渡过程中的中间状态。作为原型金属-绝缘体过渡材料,我们在室温下捕获了一种不寻常的类似金属的单斜晶相,该相已被长期预测。 L-抗坏血酸分子与二氧化钒纳米束的配位键诱导电荷载流子密度重组,并稳定金属单斜二氧化钒,从而消除了轨道选择性Mott相关性,从而消除了二氧化钒金属-绝缘子过渡带的缝隙。我们的研究有助于完成金属-绝缘体过渡过程中的相演化路径,并且我们预期配位化学可能是用于低维相关固体工程性质的有力工具。

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