VO2中电学与结构相变的动力学解耦
Kinetically Decoupled Electrical and Structural Phase Transitions in VO2
AI总结：
本文通过电阻率、拉曼光谱和超快热反射测量研究VO2相变动力学，发现绝缘体-金属转变与结构相变在高温扫描速率下解耦，并将异常一级相变行为归因于电子热导率显著降低。
摘要：
二氧化钒（VO2）因其近室温的绝缘体-金属转变及伴随的结构相变而受到广泛关注。然而，VO2中温度诱导的绝缘体-金属转变及伴随结构相变背后的物理机制尚未被完全理解。我们借助电阻率测量和拉曼光谱研究了VO2上述相变行为的动力学。跨越温度诱导绝缘体-金属转变的电阻热滞回线标度与弛豫测量揭示了这一一级相变的异常行为，而拉曼弛豫测量表明VO2中温度诱导的结构相变遵循常规行为，并与平均场预言一致。在更高的温度扫描速率下，绝缘体-金属转变与结构相变的解耦得到确认。VO2中观测到的异常一级相变行为被归因于非常规的准粒子动力学，即在绝缘体-金属转变过程中电子热导率显著降低，这一点已通过超快光泵浦-探测时域热反射测量得到证实。
英文摘要：
Vanadium dioxide (VO2) has drawn significant attention for its near room temperature insulator to metal transition and associated structural phase transition. The underlying Physics behind the temperature induced insulator to metal and concomitant structural phase transition in VO2 is yet to be fully understood. We have investigated the kinetics of the above phase transition behaviors of VO2 with the help of resistivity measurements and Raman spectroscopy. Resistance thermal hysteresis scaling and relaxation measurements across the temperature induced insulator to metal transition reveal the unusual behaviour of this first-order phase transition, whereas Raman relaxation measurements show that the temperature induced structural phase transition in VO2 follows usual behaviour and is consistent with mean field prediction. At higher temperature sweeping rates decoupling of insulator to metal transition and structural phase transition have been confirmed. The observed anomalous first order phase transition behavior in VO2 is attributed to the unconventional quasi particle dynamics, i.e. significantly lowered electronic thermal conductivity across insulator to metal transition, which is confirmed by ultrafast optical pump-probe time domain thermoreflectance measurements.
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