The temperature dependence of electron specific heat of mercury selenide with iron impurities of low
concentration has exhibited an anomalous nonmonotoninc contribution, which is attributed to hybridized states on donor impurities. It is shown that the observed effect is described by the theory of electron specific heat, developed on the basis of quantum Fermi-liquid approach with allowance for localization and electron–electron interaction. Quantitative interpretation of the experimental data has allowed us to determine the parameters of hybridized states, that agree with those, known from other experiments. We have also found a new parameter, characterizing electron–
electron interaction in hybridized states.
PACS: 72.10.Fk Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect); PACS: 72.20.Dp General theory, scattering mechanisms; PACS: 72.80.Ey III–V and II–VI semiconductors.
Key words: semiconductors, transition element impurities, hybridized electron states, electronic specific heat.