Size effects on supercooling phenomena in strongly correlated electron systems: IrTe2 and θ-(BEDT-TTF)2RbZn(SCN)4
Size effects on supercooling phenomena in strongly correlated electron systems: IrTe2 and θ-(BEDT-TTF)2RbZn(SCN)4
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DOI：
10.1103/physrevb.97.085102
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发表时间：
2018-02-01
影响因子：
3.7
通讯作者：
Kagawa, F.
中科院分区：
文献类型：
--
作者：
Oike, H.;Suda, M.;Kagawa, F.
我们报告说，一阶相变体系统的样品小型化会导致更大程度的过冷。从理论角度来看，尺寸效应可以通过考虑两种机制来合理化：（i）成核是一种罕见且随机的事件，因此，其速率与给定样品的体积和/或表面积相关； (ii)当样品尺寸减小时，对于相对较大的样品起主要作用的主要异质成核位点被退火。我们通过实验验证了两种不同类型的强相关电子系统的过冷现象的尺寸效应：过渡金属二硫属化物IrTe2和有机导体theta-(BEDT-TTF)(2)RbZn(SCN)(4)。本研究中考虑的尺寸效应的起源并不取决于材料的微观细节；因此，它们可能经常参与小体积样本的一阶跃迁行为。
We report that the sampleminiaturization of first-order-phase-transition bulk systems causes a greater degree of supercooling. From a theoretical perspective, the size effects can be rationalized by considering two mechanisms: (i) the nucleation is a rare and stochastic event, and thus, its rate is correlated with the volume and/or surface area of a given sample; (ii) when the sample size decreases, the dominant heterogeneous nucleation sites that play a primary role for relatively large samples are annealed out. We experimentally verified the size effects on the supercooling phenomena for two different types of strongly correlated electron systems: the transition-metal dichalcogenide IrTe2 and the organic conductor theta-(BEDT-TTF)(2)RbZn(SCN)(4). The origin of the size effects considered in this study does not depend on microscopic details of the material; therefore, they may often be involved in the first-order-transition behavior of small-volume specimens.