Magneto-Optical Measurements on the 0.839 eV Emission in GaAs:Cr

  • N. Killoran
  • B. C. Cavenett
  • W. E. Hagston


The origin of the 0.839 eV emission in semi-insulating GaAs:Cr has been investigated by optically detected magnetic resonance (ODMR) and Zeeman spectroscopy on the zero phonon line and satellites. The Zeeman measurements have been carried out for B∥<111>, <110> and <100> as well as angular dependence of the splittings in the (110) plane. The results show that the centre has a symmetry axis along the < 111> direction, with a small orthorhombic distortion and these conclusions are in agreement with the ODMR signal angular dependence. The experiments show that the emission does not arise from the <100> Jahn-Teller distorted Cr2+ centre observed in EPR but is due to a <111> centre such as that suggested by White where an exciton recombines at a (Cr2+-D+) pair.


Angular Dependence Zeeman Splitting Optically Detect Magnetic Resonance Defect Axis Optically Detect Magnetic Resonance Spectrum 
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Copyright information

© N. Killoran, B.C. Cavenett and W.E. Hagston 1980

Authors and Affiliations

  • N. Killoran
    • 1
  • B. C. Cavenett
    • 1
  • W. E. Hagston
    • 1
  1. 1.Department of PhysicsUniversity of HullHullUK

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