Pressure-induced amorphization (PIA) and thermal-driven recrystallization have been observed in many crystalline materials. However, controllable switching between PIA and a metastable phase has not been described yet, due to the challenge to establish feasible switching methods to control the pressure and temperature precisely. Here, we demonstrate a reversible switching between PIA and thermally-driven recrystallization of VO2(B) nanosheets. Comprehensive in situ experiments are performed to establish the precise conditions of the reversible phase transformations, which are normally hindered but occur with stimuli beyond the energy barrier. Spectral evidence and theoretical calculations reveal the pressure-structure relationship and the role of flexible VOx polyhedra in the structural switching process. Anomalous resistivity evolution and the participation of spin in the reversible phase transition are observed for the first time. Our findings have significant implications for the design of phase switching devices and the exploration of hidden amorphous materials.

中文翻译：

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VO2（B）纳米片中压力诱导的非晶化和热驱动的重结晶之间的可逆切换。

在许多晶体材料中都观察到了压力诱导的非晶化（PIA）和热驱动的重结晶。然而，由于建立可行的切换方法以精确控制压力和温度的挑战，尚未描述PIA和亚稳相之间的可控切换。在这里，我们展示了PIA和VO2（B）纳米片的热驱动重结晶之间的可逆转换。进行了全面的原位实验，以建立可逆相变的精确条件，该条件通常是受阻的，但在超出能垒的刺激下会发生。光谱证据和理论计算揭示了压力-结构关系以及柔性VOx多面体在结构转换过程中的作用。首次观察到电阻率异常变化和自旋参与可逆相变。我们的发现对相开关器件的设计和隐藏无定形材料的探索具有重要意义。