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Published on: June 9, 2023
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Pulsed field magnetization in rare-earth kagome systems
1National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
Summary
Pulsed field magnetization measurements reveal distinct magnetic behaviors in rare-earth kagome systems Nd3Ga5SiO14 and Pr3Ga5SiO14. These differences stem from the distinct electronic properties of Nd(3+) (Kramers) and Pr(3+) (non-Kramers) ions.
Area of Science:
- Condensed Matter Physics
- Magnetism
- Materials Science
Background:
- Rare-earth kagome systems R3Ga5SiO14 exhibit cooperative paramagnetism.
- Previous studies indicated correlated spin clusters in these weakly frustrated systems using neutron scattering, ESR, and NMR.
Purpose of the Study:
- To investigate the magnetic responses of Nd3Ga5SiO14 (NGS) and Pr3Ga5SiO14 (PGS) single crystals under pulsed magnetic fields.
- To explore the influence of ion type (Kramers vs. non-Kramers) and crystal field effects on magnetic behavior.
Main Methods:
- Pulsed field magnetization measurements (0-60 T, 25 ms) were performed on single crystals of NGS and PGS.
- Measurements were conducted at temperatures as low as 450 mK.
- Comparison of magnetic responses between Nd(3+) and Pr(3+) containing kagome systems.
Main Results:
- NGS displayed a low-field plateau, saturation in high fields, and significant hysteresis.
- PGS showed no saturation up to 60 T, and exhibited no hysteresis or plateaus.
- Observed magnetization behavior deviated from Heisenberg model predictions for kagome systems with large easy-axis anisotropy.
- Extremely slow spin dynamics were observed in NGS below 4 K.
Conclusions:
- Striking differences in magnetic responses between NGS and PGS were attributed to their distinct Kramers (Nd3+) and non-Kramers (Pr3+) ion characteristics and differing crystal field effects.
- The slow spin dynamics in NGS are consistent with models for Kramers ions and explain its pulsed field magnetization features.
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