Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4 : A Raman spectroscopy study on the interplay between ion exchange and polarization switching

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review B Pub Date : 2024-12-30 DOI:10.1103/physrevb.110.214115

Cherrie S. J. Lee, Carlota Canalias, Robin Buschbeck, Boris Koppitz, Franz Hempel, Zeeshan Amber, Lukas M. Eng, Michael Rüsing

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引用次数: 0

Abstract

Recently, ion exchange (IE) has been used to periodically modify the coercive field (Ec) of the crystal prior to periodic poling, to fabricate fine-pitch domain structures in Rb-doped KTiOPO4 (RKTP). Here, we use micro-Raman spectroscopy to understand the impact of IE on the vibrational modes related to the Rb/K lattice sites, TiO6 octahedra, and PO4 tetrahedra, which all form the basis of the RKTP crystal structure. We analyze the Raman spectra of three different RKTP samples: (1) a RKTP sample that shows a poled domain grating only, (2) a RKTP sample that has an Ec grating only, and (3) a RKTP sample that has both an Ec and a domain grating of the nominally same spacing. This allows us to determine the impact of IE on the vibrational modes of RKTP. We characterize the changes in the lower Raman peaks related to the alkali-metal ions, as well as observe lattice modifications induced by the incorporation of Rb+ that extend further into the crystal bulk than the expected IE depth. Moreover, the influence of IE on the domain walls is also manifested in their Raman peak shift. We discuss our results in terms of the deformation of the PO4 and TiO6 groups. Our results highlight the intricate impact of IE on the crystal structure and how it facilitates periodic poling, paving the way for further development of the Ec-engineering technique.

Published by the American Physical Society

2024

查看原文本刊更多论文

离子交换对铷掺杂KTiOPO4中振动模式的影响：离子交换与极化开关相互作用的拉曼光谱研究

近年来，离子交换（IE）被用于在周期性极化之前周期性地改变晶体的矫顽力场（Ec），以制备含铷KTiOPO4 （RKTP）的细间距畴结构。在这里，我们使用微拉曼光谱来了解IE对Rb/K晶格位、TiO6八面体和PO4四面体相关的振动模式的影响，这些都构成了RKTP晶体结构的基础。我们分析了三种不同RKTP样品的拉曼光谱：(1)仅显示极化畴光栅的RKTP样品，(2)仅显示Ec光栅的RKTP样品，以及(3)同时具有名义上相同间距的Ec和畴光栅的RKTP样品。这使我们能够确定IE对RKTP振动模式的影响。我们描述了与碱金属离子相关的低拉曼峰的变化，并观察到Rb+的掺入引起的晶格修饰，这种修饰比预期的IE深度延伸到晶体体中。此外，IE对畴壁的影响还表现在它们的拉曼峰位移上。我们从PO4和TiO6基团的变形角度讨论了我们的结果。我们的研究结果强调了IE对晶体结构的复杂影响，以及它如何促进周期性极化，为进一步发展ec工程技术铺平了道路。2024年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter