Density of the Conduction Electrons at the Nuclei in Indium Antimonide

Abstract

The Overhauser shift of the electron spin resonance due to the natural nuclear polarization at liquidhelium temperatures has been used to measure the conduction-electron density at the nuclei in $n$-type InSb. The results are: ${\left|\psi \right(R_{\mathrm{In}}\left)\right|}^2=(9.35\mathrm{}\pm 1)\times {10}^{25}$ ${\mathrm{cm}}^{-3\mathrm{}}$, and $\frac{{\left|\psi \right(R_{\mathrm{Sb}}\left)\right|}^2}{{\left|\psi \right(R_{\mathrm{In}}\left)\right|}^2}=1.70\mathrm{}\pm 0.1$ indicating that the electron is equally shared between the In and Sb ions. This is discussed in relation to the chemical bond and effective charge. Hot-electron effects in relation to nuclear polarization and the Overhauser effect are presented.