Abstract
Results from isofrequency and frequency-dependent thermally detected EPR experiments on the GaAs:Cr3+ system are reported. These data and those obtained previously by Krebs and Stauss using conventional EPR are then used to obtain the parameters appearing in the effective Hamiltonian of the 4T1 ground state of the Cr3+ ion. It is shown that this effective Hamiltonian is that of a strongly coupled, orthorhombic Jahn-Teller system in which certain random static strains play an important role in determining the experimental results. It is suggested that the GaAs:Cr3 system is an ideal example of an orthorhombic Jahn-Teller system as seen by EPR because the first excited 2E state of the ion is very close in energy to the 4T1 ground state. This causes much admixing, so the resonances within the two lowest Kramers doublets are clearly separated. The difficulties in deducing values for all the fundamental parameters are also discussed.
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