<i>s</i>,<i>p</i>-<i>d</i>exchange interaction in Cr-based diluted magnetic semiconductors

Abstract

The s,p-d exchange interaction in Cr-based diluted magnetic semiconductors was studied by means of polarized magnetoreflectance and magnetization at T=2 K. The exchange constant ${\mathit{N}}_{0}$\ensuremath{\alpha}-${\mathit{N}}_{0}$\ensuremath{\beta} for four different zinc chalcogenides (${\mathrm{Zn}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Cr}}_{\mathit{x}}$Se, ${\mathrm{Zn}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Cr}}_{\mathit{x}}$${\mathrm{Se}}_{0.95}$${\mathrm{S}}_{0.05}$, ${\mathrm{Zn}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Cr}}_{\mathit{x}}$S, and ${\mathrm{Zn}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Cr}}_{\mathit{x}}$Te) was determined. Assuming constant ${\mathit{N}}_{0}$\ensuremath{\alpha} a chemical trend in ${\mathit{N}}_{0}$\ensuremath{\beta} variation is discussed. \textcopyright{} 1996 The American Physical Society.