Observation of a Novel Electron Paramagnetic Resonance in Germanium Containing Dislocations

The first observation of EPR of electrons at dislocations in Ge is reported. Under optical excitation two sets of lines are detected: four lines about the $〈111〉$ axes with g_∥=0.34 and g_⊥=1.94, and 24 lines with g_∥=0.73 and g_⊥=1.89 about $〈111〉$ axes with a sixfold 1.2^∘{} distortion. The lines persist for hours after excitation and are inverted in sign.