Mutual Dependence of the Properties of Mn²⁺ and Gd³⁺ Impurity Ions in Narrow-Band Semiconductor Pb_{1 – x – y – z}Cu_xMn_yGd_zS: A Spectroscopic Study of Electron Paramagnetic Resonance

Abstract

EPR spectroscopy reveals a pronounced magnetoresistive effect in samples of mixed ${\text{P}}{{{\text{b}}}_{{1 - x - y - z}}}{\text{C}}{{{\text{u}}}_{x}}{\text{M}}{{{\text{n}}}_{y}}{\text{G}}{{{\text{d}}}_{z}}$ crystal (x ≈ 3 × 10⁻³, y ≈ z ≈ 1.5 × 10⁻⁴), along with unusual temperature dependences of the shape of the spectral lines of Gd³⁺ and Mn²⁺ paramagnetic centers. The parameters of spin Hamiltonians and the shapes of the spectral lines of the considered centers are determined.