Giant Photocaloric Effects across a Vast Temperature Range in Ferroelectric Perovskites,Physical Review Letters

当前位置： X-MOL 学术 › Phys. Rev. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Giant Photocaloric Effects across a Vast Temperature Range in Ferroelectric Perovskites
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-10 , DOI: 10.1103/physrevlett.133.116401
Riccardo Rurali ₁ , Carlos Escorihuela-Sayalero _{2,

2} , Josep Lluís Tamarit _{2,

2} , Jorge Íñiguez-González _{3,

4} , Claudio Cazorla _{2,

2}

Affiliation

Solid-state cooling presents an energy-efficient and environmentally friendly alternative to traditional refrigeration technologies that rely on thermodynamic cycles involving greenhouse gases. However, conventional caloric effects face several challenges that impede their practical application in refrigeration devices. First, operational temperature conditions must align closely with zero-field phase-transition points; otherwise, the required driving fields become excessively large. However, phase transitions occur infrequently near room temperature. Additionally, caloric effects typically exhibit strong temperature dependence and are sizable only within relatively narrow temperature ranges. In this Letter, we employ first-principles simulation methods to demonstrate that light-driven phase transitions in polar oxide perovskites have the potential to overcome such limitations. Specifically, for the prototypical ferroelectric

{KNbO}_{3}

we illustrate the existence of giant “photocaloric” effects induced by light absorption (

Δ S_{PC} \sim 100 J K^{- 1} {kg}^{- 1}

and

Δ T_{PC} \sim 10 K

) across a vast temperature range of several hundred Kelvin, encompassing room temperature. These findings are expected to be generalizable to other materials exhibiting similar polar behavior.

中文翻译：

铁电钙钛矿在大温度范围内的巨大光热效应

固态冷却为依赖涉及温室气体的热力循环的传统制冷技术提供了一种节能且环保的替代方案。然而，传统的热量效应面临着一些阻碍其在制冷设备中实际应用的挑战。首先，工作温度条件必须与零场相变点紧密一致；否则，所需的驱动场就会变得过大。然而，在室温附近很少发生相变。此外，热量效应通常表现出强烈的温度依赖性，并且仅在相对较窄的温度范围内才相当大。在这封信中，我们采用第一原理模拟方法来证明极性氧化物钙钛矿中的光驱动相变有可能克服这些限制。具体来说，对于原型铁电体