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

M. H. Dehn; J. K. Shenton; D. J. Arseneau; W. A. MacFarlane; G. D. Morris; A. Maigné; N. A. Spaldin; R. F. Kiefl

doi:10.1103/PhysRevLett.126.037202

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

Materials Science 2021-01-25 v1

Authors: M. H. Dehn , J. K. Shenton , D. J. Arseneau , W. A. MacFarlane , G. D. Morris , A. Maigné , N. A. Spaldin , R. F. Kiefl

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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 $_3$ .

Keywords

muon spin rotation muon-polaron complexes Fe2O3 local electronic structure antiferromagnet hydrogen impurities charge carriers

Cite

@article{arxiv.2101.09235,
  title  = {Local Electronic Structure and Dynamics of Muon-Polaron Complexes in Fe$_2$O$_3$},
  author = {M. H. Dehn and J. K. Shenton and D. J. Arseneau and W. A. MacFarlane and G. D. Morris and A. Maigné and N. A. Spaldin and R. F. Kiefl},
  journal= {arXiv preprint arXiv:2101.09235},
  year   = {2021}
}

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

Abstract

Keywords

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