Electronic structure of anomalous muonium in GaP and GaAs

J. W. Schneider, K. Chow, R. F. Kiefl, S. R. Kreitzman, A. MacFarlane, R. C. DuVarney, T. L. Estle, R. L. Lichti, and C. Schwab
Phys. Rev. B 47, 10193 – Published 15 April 1993
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Abstract

The nuclear hyperfine structure of anomalous muonium in GaP has been resolved using muon level-crossing resonance. We find that 43% of the unpaired electron spin density resides on the nearest-neighbor Ga and 35% on the nearest-neighbor P on the 〈111〉 axis of symmetry. The s and p character of the unpaired spin density indicates that the Ga and P are displaced 0.23 and 0.54 Å away from the bond center. The now complete set of measured muon and nearest-neighbor nuclear hyperfine parameters for anomalous muonium in GaP and GaAs allows a detailed comparison of the two compounds, showing that the distribution of spin density among the group-III and group-V nearest neighbors in GaP is almost exactly the opposite of that in GaAs. This is contrary to what one would expect from a simple model of anomalous muonium in compound semiconductors involving an account of bonding characteristics.

  • Received 27 October 1992

DOI:https://doi.org/10.1103/PhysRevB.47.10193

©1993 American Physical Society

Authors & Affiliations

J. W. Schneider, K. Chow, R. F. Kiefl, S. R. Kreitzman, and A. MacFarlane

  • TRIUMF, Department of Physics, and Canadian Institute for Advanced Research, University of British Columbia, Vancouver, British Columbia, Canada V6T 2A3

R. C. DuVarney

  • Department of Physics, Emory University, Atlanta, Georgia 30322

T. L. Estle

  • Department of Physics, Rice University, Houston, Texas 77251

R. L. Lichti

  • Department of Physics, Texas Tech University, Lubbock, Texas 79409

C. Schwab

  • Centre de Recherches Nucléaires, F-67037 Strasbourg, France

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Vol. 47, Iss. 16 — 15 April 1993

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