Growth and characterisation of Pb1-xEuxTe

摘要: Pb1-xEuxTe single-crystalline epitaxial films were prepared by a modified hot-wall technique. The structural properties checked X-ray diffractometry and microprobe analysis. Single-phase material with up to 5% Eu content was produced. Transport investigated between 5 300K yielding electron concentrations mobilities comparable those of PbTe layers. direct energy gap its dependence on as well temperature determined optical absorptance reflectance measurements using Fourier transform spectroscopy. This technique also yielded the phonon free-carrier contributions dielectric function in far-infrared region. Intraband magneto-optical experiments carried out Faraday Voigt geometries order obtain information effective masses their anisotropies. For interpretation these transmittance data frequency magnetic field, Drude model calculation for this many-valley system performed. geometry particular, tensor appropriate complex refractive indices ordinary extraordinary modes are treated detail. Shubnikov-de Haas reveal that L valleys not occupied carriers equally. Magneto-optical studies 50K confirm findings. Possible sources carrier repopulation change discussed.