EPR measurements on chromium doped GaAs,GaP and InP |
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Authors: | NK Goswami RC Newman JE Whitehouse |
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Institution: | J.J. Thomson Physical Laboratory, University of Reading, Whiteknights, Reading, UK |
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Abstract: | EPR measurements have been made on chromium doped GaAs samples at 4.2 K. An n-type sample doped with chromium and silicon was irradiated with 2 MeV electrons to lower the Fermi level. No resonance from substitutional Cr+ (3d5) was detected, although the Crs2+ spectrum was observed. The generally accepted assignment of a spectrum to Crs+ for photoexcited samples must therefore be revised. An isotropic resonance with g = 2 is observed in p-type chromium doped GaAs, GaP and InP but it is still not clear whether this is due to Crs4+ or interstitial Cri+ (3d5). |
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