Quantum Critical Behaviour in Spin and Charge Ordered Systems

自旋和电荷有序系统中的量子临界行为

• 批准号: 1805371
• 金额: --
• 依托单位: University of Cambridge
• 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-1805371
• 关键词: Quantum; Critical; Behaviour; Spin; Charge

Quantum properties of SrTiO3, such as its Incipient ferroelectricity and tendency to remain paraelectric down to the lowest temperatures have fascinated condensed matter physicists for several decades. At these low temperatures however SrTiO3 and similar materials lie close to a transition to a displacive ferroelectric phase in their phase diagrams. Such materials offer good opportunities for studying the effects of tuning the material away from this zero-temperature, quantum critical transition by the varying of an external parameter. The application of hydrostatic pressure tunes SrTiO3 away from the region in which quantum fluctuations dominate and, through precise dielectric measurement, allows for a large region of the phase diagram to be mapped and for the observation of possible emergent phases. Measurements taken in this manner have also shown evidence for Quantum Criticality and evolution of a new possible phase boundary. The techniques used should also allow study of complex behaviour in systems with two or more coupled order parameters, such as the multiferroic EuTiO3.

SrTiO 3的量子特性，例如其初始铁电性和在最低温度下保持顺电性的趋势，已经吸引了凝聚态物理学家几十年。然而，在这些低温下，SrTiO 3和类似材料在它们的相图中接近于向位移铁电相的转变。这样的材料提供了很好的机会，通过改变外部参数来研究将材料从这种零温度量子临界转变中调谐出来的效果。流体静压的应用调谐SrTiO 3远离量子波动占主导地位的区域，并通过精确的介电测量，允许绘制相图的大区域，并观察可能出现的相位。以这种方式进行的测量也显示了量子临界性和新的可能相边界演化的证据。所使用的技术还应允许研究具有两个或多个耦合序参数的系统中的复杂行为，例如多铁性EuTiO 3。

项目成果

Emergent magnetic phases in pressure tuned van-der-Waals antiferromagnet FePS3

压力调谐范德华反铁磁体 FePS3 中的涌现磁相

• DOI: 10.17863/cam.59896
• 发表时间: 2021
• 作者: Coak M

Structural and magnetic phases in pressure-tuned quantum materials

压力调谐量子材料中的结构相和磁性相

• 发表时间: 2020
• 作者: Jarvis David

Dielectric Response of Quantum Critical Ferroelectric as a Function of Pressure.

• DOI: 10.1038/s41598-018-33320-2
• 发表时间: 2018-10-08
• 期刊: Scientific reports
• 影响因子: 4.6
• 作者: Coak MJ;Haines CRS;Liu C;Jarvis DM;Littlewood PB;Saxena SS
• 通讯作者: Saxena SS

Bulk properties of the van der Waals hard ferromagnet VI3

范德华硬铁磁体 VI3 的体积特性

• DOI: 10.17863/cam.35816
• 发表时间: 2019
• 作者: Son S