Single Crystal Growth at Warwick

沃里克的单晶生长

• 批准号: EP/M028771/1
• 负责人: Geetha Balakrishnan
• 金额: $ 65.59万
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FM028771%2F1
• 关键词: Single; Crystal; Growth; Warwick

In the study of problems that arise in condensed matter physics, high quality single crystals are essential. A number of materials of interest tend to exhibit anisotropic behaviour, either as a result of their crystal structure and interactions or as a consequence of the application of magnetic fields or pressure. The underlying physics of such materials can only be unravelled by investigations on high quality crystals. Single crystal growth is of strategic importance for the study of the physics of condensed matter within UK laboratories. Competition in this field is strong between groups in Europe, Japan and the USA. The Warwick single crystal growth effort has been operating successfully for over two decades satisfying both in-house and external demand for single crystal specimens of a very wide range of materials. Our experience in this field which has been built up over many years allows us to be at the forefront of investigations of the properties of new and exotic materials as soon as they are discovered. The work of the Superconductivity and Magnetism Group Warwick centres on the investigation of strongly correlated electron systems. The use of in-house experimentation on single crystals, complemented by studies at central facilities using techniques such as neutron and x-ray scattering, muon spectroscopy as well as ARPES and measurements in high magnetic fields enables us to adopt a multi-pronged approach to the study of a range of materials. These studies are used to arrive at a unified picture of the physics of the materials of interest.We propose to expand on our capabilities to tackle the crystal growth of several newly discovered materials, building on our extremely successful crystal growth activities. We will produce high quality single crystals of oxides, selenides, silicides, borides, inter-metallics and related materials. These include various low-dimensional and frustrated magnets, rare earth based magnetic materials, 2D/layered materials, helimagnetic materials, exotic superconductors and topological insulators. For crystal growth by the floating zone technique, we will use the three optical mirror furnaces that we have at Warwick (two halogen lamp furnaces and one xenon arc lamp furnace). The optical mirror furnaces allow us to grow crystals under different growth conditions including various gas atmospheres, in pressures of up to 10 bars and at temperatures of up to 3000 C. Alternative techniques such as flux growth, Bridgman growth and chemical vapour transport will be used for the growth of single crystal materials when the floating zone technique is not suitable. The Czochralski technique will be used to produce single crystals of inter metallic materials using the tetra-arc furnace.The single crystals grown are to be used in all of our EPSRC funded work. As in the past, the crystals will also be made available to other researchers within the UK and internationally. The crystal growth programme supports an extremely wide collaborative network that we have built up over many years. The work continues to stimulate the formation of new collaborations and benefits the wider materials and physics community in the UK and internationally.

在研究凝聚态物理中出现的问题时，高质量的单晶是必不可少的。许多感兴趣的材料倾向于表现出各向异性行为，这要么是由于它们的晶体结构和相互作用，要么是由于施加磁场或压力的结果。这些材料的基本物理性质只能通过对高质量晶体的研究来揭示。单晶生长对英国实验室中凝聚态物理的研究具有重要的战略意义。欧洲、日本和美国的集团在这一领域的竞争非常激烈。沃里克单晶生长工作已经成功运行了二十多年，满足了对各种材料单晶样品的内部和外部需求。我们在这一领域积累了多年的经验，使我们能够在新材料和外来材料被发现时就处于研究的前沿。沃里克超导和磁性小组的工作集中在强相关电子系统的研究上。我们对单晶进行内部实验，并在中心设施使用中子和x射线散射、介子光谱学、ARPES和高磁场测量等技术进行研究，使我们能够采用多管齐下的方法研究一系列材料。这些研究是用来对感兴趣的材料的物理性质得出一个统一的认识。我们建议在我们非常成功的晶体生长活动的基础上，扩大我们的能力，以解决几种新发现材料的晶体生长问题。我们将生产高质量的氧化物、硒化物、硅化物、硼化物、金属间化合物及相关材料的单晶。这些包括各种低维和受挫磁铁，稀土基磁性材料，二维/层状材料，helimagnetic材料，外来超导体和拓扑绝缘体。为了通过浮区技术生长晶体，我们将使用沃里克大学的三个光学镜面炉（两个卤素灯炉和一个氙弧灯炉）。光学镜面炉使我们能够在不同的生长条件下生长晶体，包括各种气体气氛，在高达10巴的压力和高达3000摄氏度的温度下生长晶体。当浮动区技术不合适时，可以使用通量生长、布里奇曼生长和化学蒸汽输送等替代技术来生长单晶材料。用四弧炉生产金属间材料的单晶，将采用查克拉尔斯基技术。生长的单晶将用于我们所有的EPSRC资助的工作。和过去一样，这些晶体也将提供给英国和国际上的其他研究人员。晶体生长计划支持我们多年来建立的极其广泛的合作网络。这项工作将继续促进新的合作的形成，并使英国和国际上更广泛的材料和物理界受益。

项目成果

Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor.

• DOI: 10.1038/ncomms11711
• 发表时间: 2016-05-23
• 期刊: Nature communications
• 影响因子: 16.6
• 作者: Bawden L;Cooil SP;Mazzola F;Riley JM;Collins-McIntyre LJ;Sunko V;Hunvik KW;Leandersson M;Polley CM;Balasubramanian T;Kim TK;Hoesch M;Wells JW;Balakrishnan G;Bahramy MS;King PD
• 通讯作者: King PD

Field Induced Magnetic States in Holmium Tetraboride

四硼化钬中的场感应磁场

• DOI: 10.48550/arxiv.1612.08025
• 发表时间: 2016
• 作者: Brunt D

Spin-valley locking in the normal state of a transition-metal dichalocogenide superconductor

过渡金属二卤化物超导体正常状态下的自旋谷锁定

• DOI: 10.48550/arxiv.1603.05207
• 发表时间: 2016
• 作者: Bawden L

Magnetic properties and crystal field in Pr 2 Zr 2 O 7

Pr 2 Zr 2 O 7 的磁性和晶体场

• DOI: 10.1103/physrevb.94.134428
• 发表时间: 2016
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Bonville P

Investigation of the transport, magnetic and flux pinning properties of the noncentrosymmetric superconductor TaRh2B2 under hydrostatic pressure

• DOI: 10.1016/j.physc.2019.1353586
• 发表时间: 2020-04-15
• 期刊: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
• 影响因子: 1.7
• 作者: Arumugam, S.;Subbulakshmi, N.;Balakrishnan, G.
• 通讯作者: Balakrishnan, G.