s,p-dexchange 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 ${\mathit{N}}_0$α-${\mathit{N}}_0$β for four different zinc chalcogenides (${\mathrm{Zn}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Cr}}_{\mathit{x}}$Se, ${\mathrm{Zn}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Cr}}_{\mathit{x}}$ ${\mathrm{Se}}_{0.95}$ ${\mathrm{S}}_{0.05}$, ${\mathrm{Zn}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Cr}}_{\mathit{x}}$S, and ${\mathrm{Zn}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Cr}}_{\mathit{x}}$Te) was determined. Assuming constant ${\mathit{N}}_0$α a chemical trend in ${\mathit{N}}_0$β variation is discussed. © 1996 The American Physical Society.