Strain-Tuning of Emergent states of Matter

物质紧急状态的应变调整

• 批准号: EP/S005005/1
• 负责人: Peter Wahl
• 金额: $ 93.9万
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FS005005%2F1
• 关键词: Strain; Tuning; Emergent; states; Matter

Future technologies such as spintronics or integrated quantum sensors require materials that do not only have outstanding electronic properties but incorporate intricate complex magnetic and structural functionalities. One large class of compounds that has the potential to play a key role in such technologies are 'Quantum Materials'. The overarching commonality is that the properties of these materials are governed by quintessential quantum mechanical phenomena e.g. stabilising coherent many body phases which are driven by electron-electron interactions. The physics of these truly advanced materials is governed by a strong interplay between different competing magnetic, charge and orbital degrees of freedom with the emergent phenomena often posing a fundamental challenge to our current level of understanding. A feature central to our proposal is that the large number of competing or cooperating charge and spin orders result in an extreme tunability of the physical properties of quantum materials - they are highly sensitive to external stimuli. This sensitivity of course makes them very attractive for applications which require controlling currents, magnetism or sensing environmental parameters. Here we will exploit this tunability through uniaxial strain, a key control parameter which has received increased attention recently. Its capability for selective symmetry control by lattice straining has been very successful in strongly changing superconducting transition temperatures, stabilising completely new phases, or changing the coupling between charge and spin density waves by symmetry control. A study of the strain-stabilized electronic states in quantum materials is technologically very challenging, requiring ideally in-situ strain tuning and spectroscopic characterization of the electronic states. We recently succeeded in combining atomically resolved spectroscopic imaging of the electronic properties of materials by scanning tunnelling microscopy with in-situ tuning of uniaxial strain. This provides a step change in our capabilities to study the impact of strain on emergent orders and the electronic structure. Combination of the atomic-scale characterization with macroscopic measurements of the properties of the strain stabilized phases will provide new insights into the interplay between the microscopic physics found at the atomic scale and macroscopic properties of the material. It will also enable us to identify new ways to manipulate emergent phases of matter using uniaxial strain.

未来的技术，如自旋电子学或集成量子传感器，要求材料不仅具有出色的电子性能，而且具有复杂的磁性和结构功能。有可能在这类技术中发挥关键作用的一大类化合物是“量子材料”。最重要的共同点是，这些材料的性质是由典型的量子力学现象决定的，例如由电子-电子相互作用驱动的稳定的相干多体相。这些真正先进的材料的物理学是由不同竞争的磁、电荷和轨道自由度之间的强烈相互作用所支配的，而新兴现象往往对我们目前的理解水平构成了根本挑战。我们提议的一个核心特征是，大量竞争或合作的电荷和自旋顺序导致量子材料的物理性质具有极端的可调性--它们对外部刺激高度敏感。当然，这种敏感度使其非常适合需要控制电流、磁性或传感环境参数的应用。在这里，我们将通过单轴应变来开发这种可调性，单轴应变是最近受到越来越多关注的关键控制参数。它的晶格应变选择性对称性控制能力在强烈改变超导转变温度、稳定全新的相或通过对称性控制改变电荷和自旋密度波之间的耦合方面非常成功。研究量子材料中应变稳定的电子态在技术上是非常具有挑战性的，理想情况下需要原位应变调谐和电子态的光谱表征。最近，我们成功地将扫描隧道显微镜对材料电子性质的原子分辨光谱成像与单轴应变的原位调谐相结合。这使我们研究应变对出现顺序和电子结构的影响的能力发生了阶段性的变化。将原子尺度的表征与应变稳定相性质的宏观测量相结合，将为原子尺度上的微观物理与材料的宏观性质之间的相互作用提供新的见解。它还将使我们能够确定利用单轴应变来操纵物质浮现相的新方法。

项目成果

Elastocaloric determination of the phase diagram of Sr$_2$RuO$_4$

Sr$_2$RuO$_4$相图的弹热测定

• DOI: 10.5445/ir/1000149212
• 发表时间: 2022
• 作者: Li Y

Tuneable electron-magnon coupling of ferromagnetic surface states in PdCoO2

• DOI: 10.1038/s41535-022-00428-8
• 发表时间: 2022-02-11
• 期刊: NPJ QUANTUM MATERIALS
• 影响因子: 5.7
• 作者: Mazzola, F.;Yim, C-M;King, P. D. C.
• 通讯作者: King, P. D. C.

Spin-orbit driven superconducting proximity effects in Pt/Nb thin films.

• DOI: 10.1038/s41467-023-40757-1
• 发表时间: 2023-08-21
• 期刊: NATURE COMMUNICATIONS
• 影响因子: 16.6
• 作者: Flokstra, Machiel;Stewart, Rhea;Yim, Chi-Ming;Trainer, Christopher;Wahl, Peter;Miller, David;Satchell, Nathan;Burnell, Gavin;Luetkens, Hubertus;Prokscha, Thomas;Suter, Andreas;Morenzoni, Elvezio;Bobkova, Irina V.;Bobkov, Alexander M.;Lee, Stephen
• 通讯作者: Lee, Stephen

Magnetic-Field Tunable Intertwined Checkerboard Charge Order and Nematicity in the Surface Layer of Sr$_2$RuO$_4$

Sr$_2$RuO$_4$表面层磁场可调交织棋盘电荷顺序和向列性

• DOI: 10.48550/arxiv.2005.00071
• 发表时间: 2020
• 作者: Marques C

Constraints on the superconducting state of Sr$_2$RuO$_4$ from elastocaloric measurements

弹热测量对 Sr$_2$RuO$_4$ 超导状态的约束

• DOI: 10.48550/arxiv.2304.07182
• 发表时间: 2023
• 作者: Palle G