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Hyperfine Interactions

, Volume 97, Issue 1, pp 193–202 | Cite as

Hyperfine interactions of111In→111Cd probe atoms on GaAs (111)B reconstructed surfaces

  • Gary L. Catchen
  • James M. Adams
  • Jianming Fu
  • D. L. Miller
Semiconductors

Abstract

We have used111In→111Cd perturbed-angular-correlation (PAC) spectroscopy to measure hyperfine interactions at surface sites on two molecular-beam-epitaxy-grown GaAs (111)B (As-terminated) reconstructed surfaces. The PAC measurements performed on the 2×2 reconstructed surfaces show two well-defined nuclear electric-quadrupole interactions that occur at two inequivalent Ga-sites on the surface. The measurements performed on the √19×√19 R 23.4° reconstructed surfaces show primarily one well-defined interaction to which corresponds a large and asymmetric EFG, in which the EFGz-axis is oriented essentially perpendicular to the surface. Annealing experiments were performed to convert one reconstruction to the other and then to reconvert it back to the original reconstruction, e.g., 2×2→√19×√19 R 23.4°→ 2×2. The PAC measurements that followed each annealing step show the characteristic frequencies for each reconstruction. This result indicates that these probe sites are thermodynamically stable. In this report, we present a brief description of the experiment and, as an example, one series of measurements that illustrates the results of an extensive investigation, which reports the first measurements of group-III bonding symmetries on a compound III–V semiconductor surface.

Keywords

GaAs Hyperfine Interaction Surface Site Extensive Investigation Reconstructed Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© J.C. Baltzer AG, Science Publishers 1996

Authors and Affiliations

  • Gary L. Catchen
    • 1
  • James M. Adams
    • 1
  • Jianming Fu
    • 2
  • D. L. Miller
    • 3
  1. 1.Department of Nuclear Engineering, Electronic Materials and Processing Research LaboratoryThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Department of Physics, Electronic Materials and Processing Research LaboratoryThe Pennsylvania State UniversityUniversity ParkUSA
  3. 3.Department of Physics, Department of Electrical Engineering, Electronic Materials and Processing Research LaboratoryThe Pennsylvania State UniversityUniversity ParkUSA

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