Quantum Spin Systems and Magnetic Frustration Investigated with High Frequency AC Susceptibility and Muons

对磁性材料基本性质的研究不断发展，导致观察到令人兴奋的新物理行为。该项目将涉及几何受挫材料的研究，其中晶格上的磁相互作用无法满足，导致多个基态，即所谓的简并态。这项工作是凝聚态物理学的一个令人兴奋的领域，因为基态外的激发可以揭示诸如在受挫材料自旋冰中观察磁单极子的行为，因为一些基态总是波动的，因为量子相互作用成为主导。近年来《自然》和《科学》杂志上大量的论文表明了这一研究领域的活力。该项目将使用卡迪夫开发的一种独特的高频电纳计和超导量子干涉装置，在低于1 K的温度下研究显示量子行为的受挫系统的动力学。您将学习低温技术的艺术，这是超导量子比特驱动中非常需要的技能。这项工作将得到辅助技术的支持，如自旋动力学的原子探针μ子。实验工作将在卡迪夫进行，使用我们最先进的稀释冰箱系统和电纳计，以及在瑞士和牛津的μ子设施。你将有机会参加国际会议，展示你的作品，并发表你的作品。这种技术组合在世界上只有少数地方可用，将使您能够理解受挫材料的复杂行为。

The study of fundamental properties of magnetic materials constantly evolves resulting in the observation of exciting new physical behaviour. This project will involve the study of geometrically frustrated materials, where magnetic interactions cannot be satisfied on a lattice leading to more than one ground state, a so called degenerate state. The work is an exciting area of condensed matter physics because excitations out of the ground state can reveal behaviour such as the observation of magnetic monopoles in the frustratedmaterial spin ice and because some ground states are always fluctuating because the quantum interactions become dominant. The large number of papers in Nature and Science in recent years demonstrate the vitality of this research area.This project will involve looking at dynamics of frustrated systems showing quantum behaviour, using a unique high frequency susceptometer and a superconducting quantum interference device developed in Cardiff at temperatures below 1 K. You will learnt the art of low temperature techniques, a highly desired skill in the drive for superconducting qubits. The work will be supported using complimentary techniques such as muons which are atomic probes of spin dynamics. Experimental work will be performed in Cardiff onour state of the art dilution fridge system and susceptometer, and at muon facilities in both Switzerland and Oxford. You will have the opportunity to travel to international conferences to present your work as well as publishing your work. This combination of techniques is available in only a few places in the world and will enable you to understand complex behaviour of frustrated materials.