New data and developments pertaining to ideas about the electron system of hybridized states of cobalt impurity atoms in a mercury selenide crystal

Abstract

New experimental data on the manifestation of hybridization and spin polarization effects in 3d-states of donor electrons of a low concentration of cobalt atoms in mercury selenide crystals are obtained. The Hall concentration and mobility of conduction electrons as a function of impurity concentration, and the temperature dependences of the electron mobility, specific heat, and elastic moduli at low temperatures, are investigated. A quantitative interpretation of the observed dependences based on an earlier-developed theory in a justified simplified model of a single localization peak in the electron density of states is performed. As a result, the hybridization parameters of the cobalt states are determined by consistently fitting the observed experimental dependences, and evidence for the spontaneous spin polarization of electrons in the temperature dependences of the impurity specific heat and impurity contribution to the elastic moduli is detected.

Особенности магнитных осцилляций в монокристалле HgSe с примесями кобальта низкой концентрации (<1 ат%)

“…Окулов, Т.Е. Говоркова и являются донорами, поставляя дополнительные электроны в зону проводимости, состояния которых гибридизируются с состояниями электронов проводимости [10].…”

Peculiarities of magnetic oscillations in HgSe monocrystal with Co impurities of low concentration (<1 at%)

“…Study of this effect influence on electrons concentration, mobility and Dingle temperature is presented in study [6], while the results of qualitative interpretation, developed under the theory of resonance scattering based on Friedel approach, are presented in study [7]. Thus, the interesting peculiarity of impurities of transition metals of low concentration (less than 1 at%) in HgSe semiconductor is their capability to appear in two effect simultaneously: from one side, they create the spontaneous magnetization caused by the presence of spin polarization [8,9], and from another side, they replace Hg atoms and act as donors, supplying the additional electrons to conductivity band, which states hybridize with conductivity electrons states [10].…”