Development and application of 2.5 GPa-25 T high-pressure high-field electron spin resonance system using a cryogen-free superconducting magnet

T Sakurai; S Kimura; M Kimata; H Nojiri; S Awaji; S Okubo; H Ohta; Y Uwatoko; K Kudo; Y Koike

doi:10.1016/j.jmr.2018.08.005

Development and application of 2.5 GPa-25 T high-pressure high-field electron spin resonance system using a cryogen-free superconducting magnet

J Magn Reson. 2018 Nov:296:1-4. doi: 10.1016/j.jmr.2018.08.005. Epub 2018 Aug 23.

Authors

T Sakurai¹, S Kimura², M Kimata², H Nojiri², S Awaji², S Okubo³, H Ohta³, Y Uwatoko⁴, K Kudo⁵, Y Koike⁶

Affiliations

¹ Research Facility Center for Science and Technology, Kobe University, Nada, Kobe 657-8501, Japan. Electronic address: tsakurai@kobe-u.ac.jp.
² Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
³ Molecular Photoscience Research Center, Kobe University, Nada, Kobe 657-8501, Japan.
⁴ Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan.
⁵ Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan.
⁶ Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan.

PMID: 30165264
DOI: 10.1016/j.jmr.2018.08.005

Abstract

We have developed a high-pressure electron spin resonance probe and successfully installed into the world's highest-field cryogen-free superconducting magnet having a maximum central field of 24.6 T. The high pressure of 2.5 GPa is achieved by the specially designed piston-cylinder pressure cell using THz-wave-transparent components. In the first application of this high-pressure high-field ESR system, we observed that the orthogonal dimer spin system SrCu₂(BO₃)₂ undergoes a quantum phase transition from the dimer singlet ground to the plaquette singlet ground states.

Keywords: Cryogen-free superconducting magnet; ESR; High magnetic field; High pressure; Quantum phase transition; SrCu(2)(BO(3))(2).