Development of high-pressure and high-field ESR system using SQUID magnetometer

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spectroscopy

Background:

• High-pressure studies are crucial for understanding material properties under extreme conditions.
• Electron Spin Resonance (ESR) spectroscopy provides microscopic insights into magnetic behavior.
• Existing high-pressure ESR systems often present handling challenges and lack simultaneous macroscopic measurements.

Purpose of the Study:

• To develop and characterize a novel high-pressure and high-field electron spin resonance (ESR) system.
• To enable simultaneous macroscopic magnetization and microscopic ESR measurements under high pressure.
• To investigate the pressure dependence of magnetic anisotropy in NiSnCl(6)·6H(2)O.

Main Methods:

• Integration of a superconducting quantum interference device (SQUID) magnetometer with a clamp-type piston cylinder pressure cell.
• Achieving magnetic fields up to 5 Tesla and pressures up to 1.5 GigaPascals (GPa).
• Utilizing a tin (Sn) superconducting transition temperature for pressure calibration.

Main Results:

• Demonstrated a user-friendly high-pressure ESR system with simultaneous macroscopic magnetization measurement capabilities.
• Precisely determined the pressure dependence of the single-ion magnetic anisotropy parameter (D) for NiSnCl(6)·6H(2)O up to 1.5 GPa.
• Successfully explained the material's magnetization behavior under pressure through the observed changes in the D value.

Conclusions:

• The developed high-pressure ESR system offers an accessible and versatile platform for condensed matter research.
• Pressure-induced changes in magnetic anisotropy significantly influence the macroscopic magnetic properties of materials.
• This system provides a powerful tool for exploring novel phenomena in materials under extreme conditions.