论文标题
同时施加磁场和压力下的相共存和相关的非平衡动力学
Phase coexistence and associated non-equilibrium dynamics under simultaneously applied magnetic field and pressure
论文作者
论文摘要
对PR0.5CA0.5CA0.5CA0.5MN0.975AL0.025O3和LA0.5CA0.5CA0.5CA0.5CA0.5CA0.5CA0.5CA0.5MNO3提出了对同时施加外部压力（P）和磁场（H）对相共存的影响的定量估计。我们发现，FM-AFM转变的非平衡动力学主要取决于P和H对超冷，过热温度以及平衡相的成核和生长速率的影响。整个过渡过程中的这些效果也导致低温下竞争阶段的相对体积分数。重要的是，在整个相位共存的整个磁场压力温度范围内，具有不同自旋和结构顺序的两个竞争阶段之间的界面在控制非平衡动力学方面起着非常重要的作用。
A quantitative estimation of the effect of simultaneously applied external pressure (P) and magnetic field (H) on the phase coexistence has been presented for Pr0.5Ca0.5Mn0.975Al0.025O3 and La0.5Ca0.5MnO3, where the ferromagnetic (FM)-metal and antiferromagnetic (AFM)-insulator phases compete in real space. We found that the nonequilibrium dynamics across the FM-AFM transition is primarily dictated by the effect of P and H on the supercooling, superheating temperatures, and the nucleation and growth rate of the equilibrium phase. These effects across the transition is also responsible for the relative volume fraction of the competing phases at low temperature. Importantly in the entire magnetic field-pressure-temperature range of phase coexistence, the interface between the two competing phases having different spin and structural order plays a very important role in controlling the non-equilibrium dynamics.
