A nuclear magnetic resonance field cycling investigation of chromium and silicon doped gallium arsenide

Abstract

The results of an NMR field cycling study of GaAs doped with Cr and Si are reported. The two materials give significantly different spectra. In view of the different doping it is suggested that the results can be interpreted in terms of quadrupolar and hyperfine enhanced Zeeman energy level cross coupling around the impurities and that NMR field cycling can therefore distinguish between deep and shallow band gap states.