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Magnetisation process in the rare earth tetraborides, NdB4 and HoB4
D Brunt1, G Balakrishnan2, D A Mayoh2
1Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom. D.Brunt@warwick.ac.uk.
Scientific Reports
|January 12, 2018
Summary
Frustrated antiferromagnets like HoB4 and NdB4 exhibit complex magnetic behaviors. These rare earth tetraborides display unique fractional magnetization plateaus and phase transitions under applied magnetic fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Frustrated antiferromagnets display complex magnetic phenomena due to competing interactions.
- Applied magnetic fields can stabilize unusual spin configurations, leading to magnetization plateaus.
Purpose of the Study:
- Investigate field-induced magnetization processes in frustrated rare earth tetraborides, specifically Holmium Tetraboride (HoB4) and Neodymium Tetraboride (NdB4).
- Characterize the magnetic phase diagrams and understand the interplay of exchange interactions and single-ion effects.
Main Methods:
- High-field magnetization measurements.
- Temperature-dependent magnetic susceptibility measurements.
- Resistivity measurements.
Main Results:
- NdB4 exhibits a fractional magnetization plateau (M/M_sat ≈ 1/4) and an unconventional transition upon cooling.
- HoB4 demonstrates a new fractional magnetization plateau (M/M_sat ≈ 1/3) at low temperatures.
- Magnetic phase diagrams for NdB4 were reconstructed for fields applied parallel and perpendicular to the c-axis.
Conclusions:
- Frustration in HoB4 and NdB4 leads to rich field-induced magnetic behaviors, including novel fractional magnetization plateaus.
- The study provides insights into the fundamental magnetic properties of rare earth tetraborides and the influence of competing interactions.
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