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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
An enhanced theoretical approach for accurate measurements of the optical and energy characteristics of semiconducting materials
 Allaham, Mohammad M. ; Košelová, Zuzana ; Sobola, Dinara ; Fohlerová, Zdenka ; Knápek, Alexandr
The absorption coefficient is an important optical property in characterizing semiconducting materials. It plays a significant role in studying optical characteristics, electrical structure, energy band structure, and the creation/annihilation of excitons when a semiconducting material absorbs electromagnetic radiation. In this study, an enhanced theoretical model will be introduced and applied to characterize thin films prepared from UPR4 (unsaturated polyester resin) single-component epoxy resin, which is important to study the charge flow at the interface of tungsten-UPR4 composite field emission cathodes.
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Low temperature part of penetration depth in conventional and unconventional superconductors
 Baničová, Lucia ; Janů, Zdeněk (advisor) ; Havela, Ladislav (referee)
In the present work I study temperature dependence of magnetic penetration depth in superconductors which allows us to determine the symetry of the order parameter, important for theoretical models. In conventional superconductors we talk about s-symetry. Energy gap is isotropic and as a consequence of this fact penetration depth grows exponencialy with the temperature. On the other hand, in unconventional superconductors with d-symetry we find the power dependence on the temperature. Anyway the exponent depends on impurities and structure of the material and the influence of these parametrs is not completely clear at the moment.
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