皮秒声学揭示了PbZrO3薄膜反铁电向铁电转变过程中声速的降低

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-01-03 DOI:10.1063/5.0244418

Shuai Wang, Yangyang Si, Wenjun Wang, Yijie Li, Zuhuang Chen, Feng He

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引用次数: 0

摘要

反铁电-铁电相变（AFE-FE）由于其在高应变传感器、热开关和脉冲功率器件中的潜在应用而引起了人们的广泛关注。为了加深我们对这种转变的理解并实现其功能，必须证明超快动力学，特别是反铁电性的晶格动力学。在这项工作中，利用皮秒声学技术测量了厚度为~ 110 nm的高质量PbZrO3外延薄膜的声速，确定其为5879±11 m/s。更重要的是，我们的现场测量结果显示，在环境条件下，在~ 364 kV/cm的外电场下，AFE-FE相变期间声速降低了约6%。当电场约为545千伏/厘米时，这种降低可以增加到约12%。此外，我们发现这种场致铁电相是亚稳态的，在环境条件下恢复需要长达数十小时，表明场致状态的记忆效应。这些发现表明，PbZrO3薄膜的fe - fe相变在声波控制方面具有广阔的应用前景。

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Reduced sound velocity in PbZrO3 thin film during antiferroelectric to ferroelectric transition revealed by picosecond acoustics

The antiferroelectric-to-ferroelectric (AFE-FE) phase transition has attracted considerable attention due to its potential applications in high-strain transducers, thermal switching, and pulsed-power devices. To deepen our understanding of this transition and enable its functionalities, ultrafast dynamics, especially lattice dynamics of antiferroelectricity, are essential to be demonstrated. In this work, the picosecond acoustics technique is applied to measure the sound velocity of a high-quality PbZrO3 epitaxial thin film with a thickness of ∼110 nm, determining it to be 5879 ± 11 m/s. More importantly, our in situ measurements reveal a reduction in sound velocity of approximately 6% during the AFE-FE phase transition under an external electric field of ∼364 kV/cm at ambient conditions. This reduction can increase to about 12% with an elevated electric field of approximately 545 kV/cm. Additionally, we found that this field-induced ferroelectric phase is metastable and the recovery takes up to tens of hours at ambient conditions, indicating a memory effect of the field-induced state. These findings suggest that the AFE-FE phase transition in PbZrO3 thin films holds promise for applications in acoustic wave manipulation.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.