Influence of pressure on a dysprosocenium single-molecule magnet
Vijay S Parmar1, Andreas M Thiel1, Rizwan Nabi2
1Department of Chemistry, Aarhus University, Langelandsgade 140, Aarhus C DK-8000, Denmark. jacobo@chem.au.dk.
Chemical Communications (Cambridge, England)
|February 13, 2023
Summary
External pressure significantly impacts dysprosocenium single-molecule magnets. Increasing pressure above 1 GPa accelerates magnetic relaxation, reducing the effective energy barrier for these high-performing materials.
Area of Science:
- Materials Science
- Solid-State Physics
- Quantum Magnetism
Background:
- Single-molecule magnets (SMMs) are crucial for developing advanced magnetic materials.
- Understanding the influence of external stimuli like pressure is vital for SMM applications.
- Dysprosocenium complexes represent a class of high-performing SMMs.
Purpose of the Study:
- To investigate the effects of external pressure on a dysprosocenium single-molecule magnet.
- To determine how pressure influences magnetic relaxation pathways and energy barriers.
- To elucidate the pressure-dependent behavior of quantum tunnelling of magnetisation (QTM) and Orbach processes.
Main Methods:
- Combined experimental techniques: X-ray diffraction and magnetometry.
- Theoretical calculations to complement experimental findings.
- Variable pressure studies to quantify changes in magnetic properties.
Main Results:
- The effective energy barrier (Ueff) decreased from ~1300 cm⁻¹ at ambient pressure to ~1125 cm⁻¹ at 3 GPa.
- Compression below 1.2 GPa showed negligible impact on the Orbach relaxation process.
- Magnetic relaxation significantly increased above 1 GPa, attributed to Raman relaxation and/or QTM.
Conclusions:
- External pressure is a critical factor modulating the magnetic properties of dysprosocenium SMMs.
- Pressure-induced changes in magnetic relaxation are primarily driven by Raman and QTM pathways at higher pressures.
- These findings provide insights for designing pressure-resilient SMMs for technological applications.
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