Local Electronic Structure and Dynamics of Muon-Polaron Complexes in Fe${}_2$O${}_3$

Abstract

We perform detailed muon spin rotation ($\mu$SR) measurements in the classic antiferromagnet Fe${}_2$O${}_3$ and explain the spectra by considering dynamic population and dissociation of charge-neutral muon-polaron complexes. We show that charge-neutral muon states in Fe${}_2$O${}_3$, despite lacking the signatures typical of charge-neutral muonium centers in nonmagnetic materials, have a significant impact on the measured $\mu$SR frequencies and relaxation rates. Our identification of such polaronic muon centers in Fe${}_2$O${}_3$ suggests that isolated hydrogen (H) impurities form analogous complexes, and that H interstitials may be a source of charge carrier density in Fe${}_2$O${}_3$.

References in corpus (8)

• Observation of magnetic vortex pairs at room temperature in a planar α-Fe2O3/Co heterostructure
• The rust challenge -- On the correlations between electronic structure, excited state dynamics and photoelectrochemical performance of hematite photoanodes for solar water splitting
• Effect of Defects on the Small Polaron Formation and Transport Properties of Hematite from First-Principles Calculations
• Local Structure and Spin Transition in Fe2O3 Hematite at High-Pressure
• Electronic structure of shallow donor state associated with muonium in rutile TiO${}_2$
• Electronic structure of Mu-complex donor state in rutile TiO${}_2$
• Observation of a charge-neutral muon-polaron complex in antiferromagnetic Cr${}_2$O${}_3$
• Polaronic nature of a muonium-related paramagnetic center in SrTiO${}_3$

Cited by in corpus (8)

• DFT+μ: Density Functional Theory for Muon Site Determination
• Ambipolar Property of Isolated Hydrogen in Oxide Materials Revealed by Muon
• Understanding muon diffusion in perovskite oxides below room temperature based on harmonic transition state theory
• Magnetostriction-Driven Muon Localization in an Antiferromagnetic Oxide
• Direct observation of oxygen polarization in Sr${}_2$IrO${}_4$ by O $K$-edge x-ray magnetic circular dichroism
• Nano-scale dynamics of hydrogen in VO${}_2$ studied by $\mu$SR
• Electron $g$-value comparison of paramagnetic muonium and hydrogen centers in rutile TiO${}_2$
• Revisiting $\mu$SR Studies of Ion Dynamics in the Light of Extended Kubo-Toyabe Model