论文标题
巨型热量效果接近$ $ $ $关键终点
Giant caloric effects close to $any$ critical end point
论文作者
论文摘要
电气效应（ECE），即由于电场的绝热变化而导致的可逆温度变化，这是由于其潜在的技术应用而引起的。基于熵论点，我们提出了一个新的框架来获得巨型ECE。我们的发现是四倍：$ i $）我们采用了最近提供的电气Grüneisen参数$γ_E$来量化ECE并讨论其优于现有的所谓电气强度； $ ii $）预测巨型热量效果$接近$ to $ $ $关键终点； $ iii $）提出潜在的钥匙成分来增强ECE的建议； $ iv $）演示$γ_e$作为与著名的Barrett公式有关的探测量子铁电的适当参数。我们的发现使我们能够在氧化物多层电容器中解释最近报告的大型ECE [Nature 575，468（2019）]，从而为该领域的新场地铺平了道路。
The electrocaloric effect (ECE), i.e., the reversible temperature change due to the adiabatic variation of the electric field, is of great interest due to its potential technological applications. Based on entropy arguments, we present a new framework to attain giant ECE. Our findings are fourfold: $i$) we employ the recently-proposed electric Grüneisen parameter $Γ_E$ to quantify the ECE and discuss its advantages over the existing so-called electrocaloric strength; $ii$) prediction of giant caloric effects $close$ to $any$ critical end point; $iii$) proposal of potential key-ingredients to enhance the ECE; $iv$) demonstration of $Γ_E$ as a proper parameter to probe quantum ferroelectricity in connection with the celebrated Barrett's formula. Our findings enable us to interpret the recently-reported large ECE at room-temperature in oxide multilayer capacitors [Nature 575, 468 (2019)], paving thus the way for new venues in the field.
