Exchange Interaction in the Diluted Semimagnetic Semiconductors Hg1−xMnxSe Under Pressure

Galvanomagnetic properties and Shubnikov‐de Haas oscillations in n‐type Hg1−xMnxSe diluted solutions for Mn concentrations 0.001 ≦ x ≦ 0.23 in magnetic fields up to 7 T at temperatures T = (0.2 to 20) K under hydrostatic pressure up to 1.6 GPa are investigated. New methods based on oscillation measurements are proposed to determine magnetic characteristics (value and sign of exchange interaction energy for magnetic ion clusters and average cluster size) of semimagnetic semiconductor diluted solid solutions. These methods permit to determine the magnetic subsystem characteristics in the range of low temperatures between the spin‐glass transition and the temperature corresponding to the binding energy of magnetic atoms in the cluster. In this temperature range, familiar methods (based on measurements of sample magnetic moments) are not effective. The methods proposed are used to determine the dependence of interaction energy on Mn concentration and pressure. It is found that Mn concentration or pressure increase causes a change in the character of cluster interaction from antiferromagnetic to ferromagnetic. The possible exchange interaction mechanisms and their contributions to the interaction energy are discussed. [Russian Text Ignored].