Microcalorimetry In Pulsed Magnetic Fields

脉冲磁场中的微量热法

• 批准号: EP/V048406/1
• 负责人: Antony Carrington
• 金额: $ 25.78万
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FV048406%2F1
• 关键词: Microcalorimetry; Pulsed; Magnetic; Fields

High magnetic field measurements of the electronic properties of materials have produced seminal breakthroughs which have transformed science. These advances, such as the quantum Hall effects were made by measuring electrical transport (resistivity, Hall effect etc). Thermodynamic probes have unique capabilities as they can reveal quantum states hidden to other probes but these are rarely attempted at very high fields because of the technical difficulties with performing them. Here we propose to develop a new generation device for measuring specific heat in very high pulsed magnetic fields, and a complementary low-cost device for creating such fields inside a laboratory environment.The use of pulsed fields would make a step-change in capability for heat-capacity studies of quantum materials, as it would greatly increase the maximum range of magnetic field-space thus allowing previously out of reach transitions to be studied. Importantly, it will also reduce enormously the carbon footprint /cost of the measurement. This new capability will allow us to study the evolution of entropy to unprecedented high fields and thus get new insights into the nature of field-induced states, such as the normal state of high temperature superconductors or quantum critical magnetic transitions. To give affordable access to magnetic fields above 50T, we will also develop a micro-pulsed magnetic field apparatus. This will enormously increase access to high fields, increasing productivity of researchers and meaning expensive experiments in international facilities will be better prepared. Many break-through, high field discoveries are serendipitous, for example integer and fractional quantum Hall effects and quantum oscillations in high temperature superconductors. So more widespread use of high magnetic field will make such breakthroughs more likely.

对材料电子特性的强磁场测量产生了开创性的突破，改变了科学。这些进展，如量子霍尔效应是通过测量电输运（电阻率，霍尔效应等）。热力学探测器具有独特的能力，因为它们可以揭示隐藏在其他探测器中的量子态，但由于执行它们的技术困难，这些探测器很少在非常高的场进行尝试。在这里，我们建议开发一种新一代的装置，用于测量在非常高的脉冲磁场中的比热，以及一种补充的低成本装置，用于在实验室环境中产生这样的场。脉冲场的使用将使量子材料热容研究的能力发生飞跃，因为它将极大地增加磁场-空间的最大范围，从而允许研究先前无法达到的转变。重要的是，它还将大大减少碳足迹/测量成本。这种新的能力将使我们能够研究熵向前所未有的高场的演化，从而获得对场诱导态性质的新见解，例如高温超导体的正常状态或量子临界磁跃迁。为了让人们能够负担得起50 T以上的磁场，我们还将开发一种微脉冲磁场设备。这将极大地增加进入高场的机会，提高研究人员的生产力，并意味着在国际设施中进行的昂贵实验将得到更好的准备。许多突破性的高场发现都是偶然的，例如整数和分数量子霍尔效应以及高温超导体中的量子振荡。因此，更广泛地使用高磁场将使这种突破更有可能。