Low-temperature magnetic field dependences of spontaneous magnetization in a low-concentration iron impurity (= 0.2 at%) electron system of a mercury selenide crystal

摘要

The results of an experimental study and theoretical description of the magnetic field dependences of the magnetization of a mercury selenide with low concentrations of iron impurities (0.01-0.2) at% at a temperature of 5 K are presented. The contributions of the spontaneous magnetism of the electron system belonging to the iron atom donor impurity hybridized states, which are shaped like saturation magnetization curves, are highlighted by performing a detailed analysis of the obtained curves. For comparative purposes, similar measurements were carried out on mercury selenide crystals without doping and with gallium impurities (0.05 at%), which allowed confirmation of the data interpretation details. Based on previously developed theoretical concepts about the electron systems under study, formulas describing the field dependences of spontaneous magnetization were obtained, and found to be in good agreement with the experimental curves. As a result of fitting the theoretical dependences to the experimental curves, the parameters characterizing the spontaneous spin magnetism of the studied impurity systems were determined; their values agree with the experimental data obtained earlier when observing Hall effect anomalies and temperature dependences of the magnetic susceptibility in the same systems. Published under license by AIP Publishing.