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Far infrared optical properties of V and Cr doped Sb2Te3 /

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Show simple item record Madubuonu, Anthony. en_US 2009-06-15T17:00:30Z 2009-06-15T17:00:30Z 2009-06-15T17:00:30Z
dc.description.abstract The far infrared reflectance of Sb2Te3 , Sbi.97Vo.o3Te3 and Sbi.94Cr .o6Te3 was measured near normal incidence at different temperatures (between 45K and 300K). The direct current resistivities of the above samples were also measured between the temperatures of 4K and 300K. Also Kramers Kronig (KK) analyses were performed on the reflectance spectra to obtain the optical conductivities. In the doped samples, it was observed that a phonon at 62cm-1 softens to about 55cm-1 on decreasing the temperature from 295K to 45K. Also, it was observed that the plasma frequency of the doped samples is independent of doping. The scattering rate for the vanadium doped sample was seen to be greater than that for the chromium doped sample despite the fact that vanadium impurity density is less than that of chromium. The Drude-Lorentz model fits to the KK optical conductivity show that the samples used in this work are conventional metals. Definitive measurements of the temperature dependence of the scattering rate across the ferromagnetic transition await equipment changes allowing measurements at low temperature using the mercury cadmium telluride (MCT) detector. en_US
dc.language.iso eng en_US
dc.publisher Brock University en_US
dc.subject Optical properties en_US
dc.title Far infrared optical properties of V and Cr doped Sb2Te3 / en_US
dc.type Electronic Thesis or Dissertation en_US M.Sc. Physics en_US Masters en_US
dc.contributor.department Department of Physics en_US Faculty of Mathematics and Science en_US

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