Electron paramagnetic resonance of free and bound holes in diamond

Abstract
Two electron paramagnetic resonance lines are observed in heavily boron-doped laboratory-made diamonds. The orientation-, temperature-, stress-and illumination-dependence of these lines is studied. It is argued that one line is due to free holes in the valence band and the other is due to holes bound to boron atoms, both resonances being made possible by large axial grown-in strains.

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