Quantum Materials in High Magnetic Fields

超导材料是一种令人兴奋的量子系统，电流在其中以极高的电流密度无阻力地流动。此外，超导线圈中产生的磁场很大，可以持续很长一段时间，由于它们的相位一致性，可以在小的结点上产生超导电流。由于其令人难以置信的特性，超导体使新技术得以实现，从发电、传输和存储、医疗保健、运输、量子计算机和未来的强大马达。因此，要理解具有改进性能的复杂超导量子材料在液氮温度下工作，需要详细了解它们的电子相，这些相促进了电子的配对和超导电性在各种实验条件下的稳定性。该项目将探索新型超导材料中超导和正常电子态的基本行为，以了解导致超导相稳定的关键因素。我们将利用不同的实验技术探索低温和强磁场下的输运和热力学性质，以构建超导相图，确定临界电流，并建立相关的电子性质。该项目将在高质量的单晶和薄片器件中使用外加应变来探索超导及其竞争电子相的可调性。量子行为的特征将通过在非常高的磁场中的量子振荡来探索。这些研究对于提供新型超导体的完整基本特征至关重要，以便开发现实的理论模型并使未来的应用发展成为可能。这些实验将在牛津大学使用牛津应用超导中心的设施和强磁场设施进行，以及在欧洲和美国的国际强磁场实验室进行。更多的测量将与牛津仪器纳米科学公司合作进行，以期改善该公司的仪器范围。

Superconducting materials are exciting quantum systems in which electrical current flows without resistance with extreme current densities. Additionally, magnetic fields created in superconducting coils are huge and can persist for long periods and a supercurrent can be created across small junctions due their phase coherence. Due to their incredible properties, superconductors enable novel technologies from energy generation, transmission and storage, healthcare, transport, quantum computers and powerful motors of the future. Thus, understanding complex superconducting quantum materials with improved properties to operate at liquid nitrogen temperatures requires a detailed knowledge of their electronic phases that promote the pairing of electrons and the stability of superconductivity to various experimental conditions. This project will explore the fundamental behaviour of superconducting and normal electronic states in novel superconducting materials in order to understand the key ingredients responsible for the stability of the superconducting phases. We will explore the transport and thermodynamic properties using different experimental techniques at low temperature and high magnetic fields in order to construct superconducting phase diagrams, to determine critical currents and to establish the relevant electronic properties. The project will explore the tunability of the superconducting and its competing electronic phases using applied strain in high quality single crystals and thin flake devices. The signatures of quantum behaviour will be explored via quantum oscillations in very high magnetic fields. These studies are essential to provide a complete fundamental characterization of novel superconductors in order to develop realistic theoretical models and enable the development of future applications.The experiments will be performed both in Oxford, using the facilities of the Oxford Centre for Applied Superconductivity and high-magnetic field facilities, as well as at international high-magnetic field laboratories in Europe and USA. Additional measurements will be carried out in collaboration with Oxford Instruments Nanoscience, with a view to improving the company's range of instruments.