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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Local Electronic Structure and Dynamics of Muon-Polaron Complexes in Fe_{2}O_{3}
M H Dehn1,2,3, J K Shenton4, D J Arseneau3
1Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
Physical Review Letters
|February 5, 2021
Summary
We identified novel muon-polaron complexes in iron(III) oxide (Fe2O3) using muon spin rotation (μSR). These complexes impact magnetic properties and suggest hydrogen impurities influence charge density.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Iron(III) oxide (Fe2O3) is a classic antiferromagnetic material.
- Understanding impurity effects is crucial for magnetic materials.
Purpose of the Study:
- To investigate the behavior of muons in Fe2O3.
- To elucidate the nature of muon-polaron complexes and their impact on magnetic properties.
Main Methods:
- Detailed muon spin rotation (μSR) spectroscopy was employed.
- Analysis considered dynamic population and dissociation of muon-polaron complexes.
Main Results:
- Charge-neutral muon states were identified in Fe2O3.
- These states significantly influenced μSR frequencies and relaxation rates, despite lacking typical muonium signatures.
- Evidence for dynamic muon-polaron complexes was established.
Conclusions:
- The study identifies polaronic muon centers in Fe2O3.
- Analogous complexes likely form with isolated hydrogen impurities.
- Hydrogen interstitials may contribute to charge carrier density in Fe2O3.
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