Charge Compensation and Spin Polarization of 119Sn(IV) Dopant Ions in the Antiferromagnetic Oxide CoO

摘要

A sample of CoO with a nonequilibrium distribution of Sn(IV) ions over structural positions with nonequivalent cationic environments was studied by Mossbauer spectroscopy. Analysis of 119Sn hyperfine coupling made it possible to calculate the partial contributions of 180 deg indirect exchange involving the egorbitals (/Jie = 30 kOe) and direct exchange involving the half-filled t_(2g) orbitals of neighboring Co(II) cations (h_(ie) = 10 kOe) to the magnetic field H at the tin nuclei.