Novel ground states and excitations in quantum spin liquids

总结：量子材料具有强大的能力，既能捕捉公众的想象力，又能推动对社会至关重要的技术的进步。40年来对量子自旋液体（qsl）的探索概括了这一说法；这项难以捉摸的研究最初被预测为高温超导性的基础，但却意外地导致了基础凝聚态物理学中一些最具突破性的发现。到目前为止，由于缺乏可研究的模型材料，制造它们的困难以及表征它们所带来的挑战，对qsl的研究受到限制。该项目将以我们最近的工作为基础，通过合成最近发现的QSL模型系统的高质量样本，并主要用最先进的中子散射技术表征其特性，来解决这些瓶颈。目的：-合成高质量的量子自旋液体候选单晶，探索电子掺杂的途径。-利用中子衍射、非弹性中子散射和电子显微镜表征QSL单晶的晶体学和磁序和激发。-提供高质量的非弹性中子散射和线性自旋波理论分析培训。在材料科学的前沿提供广泛的合成和材料表征技术培训。方法：该项目基于最近发现的高度受挫自旋1/2量子kagome磁体的合成和物理表征。它将涉及高质量的合成和单晶生长，晶体学和中子散射研究，这些研究将用于解决该材料族的磁性结构，激发和基态。该项目将涉及广泛使用UKRI资助的设施：ISIS中子和介子源，钻石光源和劳埃-朗格万研究所的中子源。该项目由格拉斯哥大学和劳-朗格万研究所共同资助，两个机构的时间大约是50:50。”

"Summary:Quantum materials have the powerful ability to both capture the public's imagination and drive advancement of technologies critical to society. The 40 year search for Quantum SpinLiquids (QSLs) encapsulates this statement; originally predicted to underpin high temperature superconductivity, this elusive search has serendipitously led to some of the most groundbreaking discoveries in fundamental condensed matter physics. Up to now, the search for QSLs is limited by the lack of model materials to study, the difficulty in making them and the challenges posed by characterising them. This project will build on our recent work addressing these bottlenecks by synthesising high quality samples of a recently discovered QSL model system and characterising its properties primarily with state-of-the-art neutron scattering techniques.Aims:- Synthesise high quality single crystals of quantum spin liquid candidates and explore routes to electronic doping.- Characterise the crystallographic and magnetic order and excitations of QSL single crystalsusing neutron diffraction, inelastic neutron scattering and electron microscopy.- Provide high quality training in inelastic neutron scattering and analysis with linear spinwave theory.- Provide a broad training in synthesis and materials characterisation techniques at theforefront of materials science.Methodology:This project is based on the synthesis and physical characterization of a recently discovered family of highly frustrated spin 1/2 quantum kagome magnets. It will involve high quality synthesis and single crystal growth, crystallography and neutron scattering studies which will be used to solve the magnetic structures, excitations and ground states of this material family. The project will involve extensive use of UKRI funded facilities: the ISIS Neutron and Muon Source, Diamond Light Source and the neutron source of the Institut Laue-Langevin. The project is co-funded between the University of Glasgow and the Institut Laue-Langevin, with time split roughly 50:50 between both institutions. "