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Anomalous Hall effect from frustration-tuned scalar chirality distribution in Pr2Ir2O7
1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Physical Review Letters
|August 6, 2013
Summary
This study explores the anomalous Hall effect in pyrochlore structures, linking magnetic field-tuned transitions to specific magnetic states like spin ice and kagome ice. The findings offer insights into complex magnetic phenomena and their conductivity signatures.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Noncoplanar magnetism in pyrochlore structures leads to complex magnetic states.
- Frustration in these materials induces spatial inhomogeneity at low temperatures.
- The anomalous Hall effect is sensitive to magnetic ordering and correlations.
Purpose of the Study:
- To investigate the anomalous Hall effect in pyrochlore materials under varying magnetic fields.
- To understand the relationship between magnetic field-induced transitions and conductivity.
- To model the influence of nonmagnetic scattering on magnetic correlations.
Main Methods:
- Theoretical modeling of the anomalous Hall effect.
- Incorporation of nonmagnetic scattering effects.
- Analysis of Hall conductivity as a function of magnetic field strength and direction.
Main Results:
- Obtained Hall conductivity (σ(H)) that matches experimental data for Pr(2)Ir(2)O(7).
- Identified a peak in σ(H) for a [111] magnetic field.
- Demonstrated this peak signifies a transition from zero-field spin ice to kagome ice.
Conclusions:
- The anomalous Hall effect can effectively probe magnetic phase transitions in pyrochlores.
- Noncoplanar magnetism and frustration play crucial roles in the observed conductivity.
- The study provides a framework for understanding experimental observations in materials like Pr(2)Ir(2)O(7).
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