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

用高频交流磁化率和 μ 子研究量子自旋系统和磁挫败

基本信息

批准号：
1797796
负责人：
金额：
--
依托单位：
CARDIFF UNIVERSITY
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1797796
关键词：
Quantum Spin Systems Magnetic Frustration

项目摘要

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.

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。这个项目将涉及几何挫折材料的研究，其中磁相互作用不能满足晶格导致一个以上的基态，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，因为基态的激发可以揭示诸如在受挫折的材料自旋冰中观察到磁单极子等行为，并且因为一些基态总是波动，因为量子相互作用成为主导。近年在《自然》和《科学》杂志上发表的大量论文，显示了这一研究领域的活力。这个项目将涉及在低于1 K的温度下，利用独特的高频温度计和在卡迪夫开发的超导量子干涉装置，观察显示量子行为的受挫折系统的动力学。您将学习低温技术的艺术，这是超导量子位驱动器中非常需要的技能。这项工作将得到支持，使用互补的技术，如μ子，这是自旋动力学的原子探针。实验工作将在卡迪夫的最先进的稀释冰箱系统和流速计，并在瑞士和牛津大学的μ介子设施。您将有机会前往国际会议，展示您的工作以及出版您的工作。这种技术的组合在世界上只有少数几个地方可用，将使您能够了解受挫折材料的复杂行为。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr_{2}X_{4} (X=Se, S).

DOI：
10.1103/physrevlett.120.137201
发表时间：
2017-05
期刊：
Physical review letters
影响因子：
8.6
作者：
Shang Gao;O. Zaharko;V. Tsurkan;L. Prodan;E. Riordan;Jorge Lago;Bjorn Faak;Andrew R. Wildes;Marek M. Koza;Clemens Ritter;Peter Fouquet;Lukas Keller;Emmanuel Can'evet;M. Medarde;Jakob Blomgren;Christer Johansson;Sean Giblin;S. Vrtnik;Jovze Luzar;A. Loidl;Christian Ruegg;Tom Fennell
通讯作者：
Shang Gao;O. Zaharko;V. Tsurkan;L. Prodan;E. Riordan;Jorge Lago;Bjorn Faak;Andrew R. Wildes;Marek M. Koza;Clemens Ritter;Peter Fouquet;Lukas Keller;Emmanuel Can'evet;M. Medarde;Jakob Blomgren;Christer Johansson;Sean Giblin;S. Vrtnik;Jovze Luzar;A. Loidl;Christian Ruegg;Tom Fennell

Tuning the dynamics in Fe3O4 nanoparticles for hyperthermia optimization