Emergent quantum phenomena near magnetic and dielectric phase transitions

调谐到量子相变附近的材料通常会出现新的量子现象。该项目将研究利用压力或应变将相变温度调到绝对零度的磁性和介电材料。理论和实验技术将被用来研究这种材料中预期出现的动力学和量子噪声谱，并寻找由磁涨落或混合极模式介导的超导电性。其他有待探索的状态包括预计将出现在量子顺电材料中的拓扑纳米极化织构，以及重费米子材料中的非费米液态金属。采用化学气相输运、电磁感应加热和脉冲激光沉积等方法合成纯单晶。电阻率、磁化率和热容测量将在50mK以下的温度下进行，并在高压和强磁场的极端条件下进行。

Materials tuned to the neighbourhood of a quantum phase transition often show the emergence of novel quantum phenomena. This project will investigate magnetic and dielectric materials in which the phase transition temperature is tuned to absolute zero using pressure or strain. Theoretical and experimental techniques will be deployed to investigate the dynamics and quantum noise spectrum anticipated to arise in such materials and to search for superconductivity mediated by magnetic fluctuations or hybrid polar modes. Other states to be explored include topological nano-polarization textures expected to emerge in quantum paraelectrics and non-Fermi liquid metals in heavy fermion materials. Pure single crystals will be synthesised using chemical vapour transport, electromagnetic induction heating and pulsed-laser deposition. Resistivity, susceptibility and heat capacity measurements will be carried out at temperatures below 50mK under the extreme conditions of high pressures and high magnetic fields.