Electron Spin-Flip Raman Scattering in PbTe

Abstract

We have observed electron spin-flip Raman scattering in $n-\mathrm{P}\mathrm{b}\mathrm{T}\mathrm{e}$ using a 10.6-μ laser and magnetic fields up to 105 kOe. From $g$-value measurements in samples with $〈111〉$, $〈110〉$, and $〈100〉$ along B, we obtain $g_{\mathrm{II}}=57.5\mathrm{}\pm 2$ and $g_{\perp }=15\mathrm{}\pm 1$. The $g_{\mathrm{II}}$ is considerably larger than that deduced previously from injection-diode fluorescence and Shubnikov—de Haas measurements. The $g_{\perp }$ measurement gives the first direct observation of anisotropy of $g$ values in PbTe. The magnetic field dependence of intensity of spin-flip scattering for different $g$-value transitions indicates shifting of electrons from high $g$-value valleys to low $g$-value valleys.