Spin Resonance of Pd and Pt in Silicon

Abstract

The transition metals Pd and Pt usually occur in diamagnetic form. However, in silicon both Pd and Pt act as acceptor impurities; the ions ${\mathrm{Pd}}^{-}$ and ${\mathrm{Pt}}^{-}$ are paramagnetic and have been studied by electron spin resonance. Both ions have a [001] and two mutually perpendicular [110] axes as principal axes of the $g$ tensor. Hyperfine interaction with ${\mathrm{Pd}}^{105}$, and ${\mathrm{Si}}^{29}$ has been detected and studied. In particular, ${\mathrm{Pd}}^{105}$ shows a strong quadrupolar interaction. The spectra are discussed in terms of models in which the ions are distorted from the normal substitutional site along a cubic direction. A second spectrum, which may represent a defect pair, has been observed for Pt.