In solid-state physics, pressure is an essential parameter, which can continuously change the interaction between electrons. The combination of terahertz electron spin resonance (THz ESR) with pressure is a powerful approach to clarify the spin state under pressure from the microscopic point of view, especially for quantum magnets. The most important feature of our high-pressure THz ESR system is that our pressure cell ensures the high pressure and wide frequency range using ceramics in internal parts, which are well balanced in terms of toughness and transmittance of electromagnetic waves. This approach allowed to very accurately describe the spin state under pressure. In this review, high-pressure ESR systems are reviewed with a focus on those in the high-frequency region. In addition, we show differences between other systems and our system. Moreover, we show the usefulness of our system by showing application examples of several magnetic materials of interest.

中文翻译：

---

高压太赫兹 ESR

在固态物理学中，压力是一个必不可少的参数，它可以不断地改变电子之间的相互作用。太赫兹电子自旋共振 (THz ESR) 与压力的结合是从微观角度阐明压力下自旋状态的有力方法，特别是对于量子磁体。我们的高压太赫兹ESR系统最重要的特点是我们的压力传感器在内部使用陶瓷确保高压和宽频率范围，这在韧性和电磁波透射率方面得到了很好的平衡。这种方法可以非常准确地描述压力下的自旋状态。在本次审查中，高压 ESR 系统被审查，重点放在高频区域。此外，我们还展示了其他系统与我们的系统之间的差异。