Optical properties of new quaternary semimagnetic crystals Hg_1-x-yCd_xMn_ySe: absorption and reflectivity measurements

Abstract

The transport and optical properties of new quaternary semimagnetic Hg, -,-,Cd,Mn,Se ( x = 0.1, 0 < y 0.1) solid solutions grown by the modified Bridgman method were investigated. The values of E, and dE,IaT as a function of Mn content were determined and a comparison of experimental and calculated data of absorption coefficients was made. Three-mode character of the compositional transformation of the phonon spectrum is ascertained. The effects of plasmon-phonon interactions were analysed taking account of the contribution of free charge carriers and interband transitions to the crystal dielectric permittivity.

Investigation of Phonons in HgCdMnTe Using Far-Infrared Reflectivity

“…1). The fitting parameters, given in Table, are reasonably comparable, in the sense of virtual crystal approximation with literature data for HgTe and its ternary alloys [4][5][6][7][8][9][10][11][12][13][14][15].…”

“…This additional band was observed in HgTe [4,5] and in other Hg compounds and Hg-rich mixed crystals, i.e. [6][7][8][9][10][11][12]. We performed a standard Kramers-Kronig analysis which yields the dielectric function ε(ω) and mode frequencies without presupposing any mode1 for response function.…”

Peculiarities of the exchange interaction in narrow-gap Hg1-x-yCdxMnySe

“…In order to avoid this obscuring influence of Mn, the energy gap in HgTe or HgSe can better be opened by adding cadmium with the subsequent controlled introduction of magnetic ions in mixed Hg 1−x Cd x Te or Hg 1−x Cd x Se crystals. Quaternary compounds Hg 1−x−y Cd x Mn y Te and Hg 1−x−y Cd x Mn y Se also have better optical and transport characteristics when compared with those in ternary Hg 1−x Cd x Te and Hg 1−x Cd x Se when their compositions are properly matched [7][8][9].…”