非热系统中无序对Spinodal不稳定性的抑制
Suppression of spinodal instability by disorder in an athermal system
摘要：
在MnNiSn基Heusler合金的热致金属-绝缘体相变过程中，观察到了非对称的临界慢化和非对称的动力学标度指数.在向绝缘体相的过渡期间，与向金属相的过渡相比，类临界特征得到增强。这些实验结果表明，亚稳相在冷却分支的滞后已接近的失稳。另一方面，在加热过程中在本征晶体缺陷之上和之上产生的扩展无序在达到亚稳点之前触发过量的异质成核。零温随机场伊辛模型（ZTRIM）模拟结果表明，当关联长度受无序点间平均距离的限制时，无序会影响失稳.
英文摘要：
We observed asymmetric critical slowing down and asymmetric dynamical scaling exponent in the superheating and supercooling kinetic processes during the thermally-induced metal-insulator transition of MnNiSn based heusler alloy. During the transition to the insulator phase, the critical-like features get enhanced compared to the transition back to the metal phase. These experimental findings suggest that the metastable phase in the cooling branch of hysteresis has approached close to the spinodal instability. On the other hand, the extended disorder, generated over and above the intrinsic crystal defects during heating, triggers the excess heterogeneous nucleation before reaching the spinodal point. Zero temperature random field Ising model (ZTRFIM) simulation, inscribed for the athermal martensitic transitions, support the argument that the disorder smears the spinodal instabilities as the correlation length is bounded by the average distance between the disorder points.
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