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<p>Electron spin resonance (ESR) measurements under multi-extreme conditions are extremely useful for exploring novel physical phenomena in condensed matter physics. However, achieving high magnetic fields, high pressures, and high sensitivity simultaneously is still challenging. In this study, we have developed basic techniques separately to achieve this goal. Using a pulsed magnetic field, we have succeeded in obtaining ESR spectra of a sample in a pressure cell up to 30 T. To improve sensitivity, we used a high output power light source gyrotron, and we achieved a 10-fold improvement in sensitivity compared to previous high-pressure ESR measurements using Gunn oscillators. Because breakthrough is needed to enable reaching higher pressures without reducing sensitivity, in this study, we focused on using the optically detected magnetic resonance of the NV<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="723_2025_1808_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(^{-}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>-</mo> </mmultiscripts> </math></EquationSource> </InlineEquation> center, and we observed it successfully in a diamond-anvil cell. The combination of these techniques offer a promising direction for future ESR measurements in more extreme environments.</p>

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Development of ESR Measurement Systems for Higher Magnetic Fields and Pressures

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Takahiro Sakurai,
  • Ayumu Shimizu,
  • Reo Hattori,
  • Susumu Okubo,
  • Hitoshi Ohta,
  • Mitsuru Akaki,
  • Yasuo Narumi,
  • Masayuki Hagiwara,
  • Keisuke Kawagita,
  • Yuya Ishikawa,
  • Yutaka Fujii,
  • Keisuke Oshimi,
  • Hiromu Nakashima,
  • Masazumi Fujiwara

摘要

Electron spin resonance (ESR) measurements under multi-extreme conditions are extremely useful for exploring novel physical phenomena in condensed matter physics. However, achieving high magnetic fields, high pressures, and high sensitivity simultaneously is still challenging. In this study, we have developed basic techniques separately to achieve this goal. Using a pulsed magnetic field, we have succeeded in obtaining ESR spectra of a sample in a pressure cell up to 30 T. To improve sensitivity, we used a high output power light source gyrotron, and we achieved a 10-fold improvement in sensitivity compared to previous high-pressure ESR measurements using Gunn oscillators. Because breakthrough is needed to enable reaching higher pressures without reducing sensitivity, in this study, we focused on using the optically detected magnetic resonance of the NV \(^{-}\) - center, and we observed it successfully in a diamond-anvil cell. The combination of these techniques offer a promising direction for future ESR measurements in more extreme environments.