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arXiv 2205.07192cond-mat.mtrl-sci
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同时施加磁场和压力下的相共存及相关的非平衡动力学

Phase coexistence and associated non-equilibrium dynamics under simultaneously applied magnetic field and pressure

Sudip Pal, Kranti Kumar, A. Banerjee

AI总结:

本研究定量评估了压力和磁场对Pr0.5Ca0.5Mn0.975Al0.025O3和La0.5Ca0.5MnO3中FM-AFM相共存及非平衡动力学的影响,发现界面在控制动力学中起关键作用。

摘要:

本文对Pr0.5Ca0.5Mn0.975Al0.025O3和La0.5Ca0.5MnO3在同时施加外部压力(P)和磁场(H)下对相共存的影响进行了定量评估,在这两种材料中,铁磁(FM)-金属相和反铁磁(AFM)-绝缘体相在实空间中相互竞争。我们发现,跨越FM-AFM转变的非平衡动力学主要由P和H对过冷、过热温度以及平衡相的成核和生长速率的影响所决定。这些跨越转变的影响也决定了低温下竞争相的相对体积分数。重要的是,在整个磁场-压力-温度相共存范围内,具有不同自旋和结构有序性的两个竞争相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。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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