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1
Content available remote Conductivity of disordered ferromagnetic monoatomic film
Paja A, Spisak B J
Materials Science Poland
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2008
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Vol. 26, No. 4
1009--1013
EN
Electron transport in the plane of a monoatomic metallic layer with non-zero magnetization is considered. The material is represented by a two-dimensional set of disordered potentials which also possess spins aligned along one axis but not necessarily oriented in one direction. Such a system can be treated as a two-component alloy. The effective cross-section for conduction electrons has been calculated. The total conductivity is obtained within two-current model.
2
Content available remote Electrical resistivity of disordered monolayer metallic films
Jarguz P., Paja A.
Materials Science Poland
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2006
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Vol. 24, No. 3
633--637
EN
Electron transport through a disordered two-dimensional array of potentials is investigated. The resistivity is calculated according to the Faber-Ziman diffraction model suitably modified for two-dimensional electron gas. The structure factor is obtained by means of numerical simulations. The pseudopotentials are assumed to be the Shaw potentials with appropriate screening. The resistivities of disordered monolayers of alkali metals have been calculated in this model using the parameters which allowed us to explain well the experimental data for the bulk materials.
3
Content available remote Conductivity and transmission coefficients of ultra-thin disordered metallic films
Spisak B.J., Paja A.
Materials Science Poland
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2006
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Vol. 24, No. 3
605--609
EN
The diffusive motion of quasi-two-dimensional electron gas through an ultra-thin system of disordered potentials is considered. In such system the Fermi sphere splits into a set of independent sheets due to the small thickness of the system. Each sheet can be seen as an electron sub-band. The electron transport goes through these sub-bands independently. The sum of electrical conductivities over these sub-bands determines the total current which is calculated for ultra-thin films of cesium. We also present the relation between our approach and Landauer formalism based on the notation of the transmission coefficient.
4
Content available remote Wodór w związkach międzymetalicznych typu faz Lavesa ziem rzadkich z manganem
Figiel H., Paja A.
Przemysł Chemiczny
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2005
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T. 84, nr 11
863-867
PL
Wśród związków międzymetalicznych ziem rzadkich i itru z metalami przejściowymi pochłaniających wodór szczególnie interesujące są związki typu faz Lavesa z manganem. W związkach tych pod wpływem wodoru zachodzą strukturalne i magnetyczne przemiany fazowe oraz zmiany ich właściwości. W pracy przedstawiono i omówiono obserwowane zjawiska dla wodorków REMn2Hx (RE = Y, Gd, Tb, Dy, Ho, Nd, Sm i Er) wskazując ich zależność od temperatury, rodzaju ziemi rzadkiej i koncentracji wodoru.
EN
A review with 34 refs. covering (Y, Gd, Tb, Dy, Ho, Nd, Sm, or Er)Mn2Hx hydrides, their prepn., Laves phases, structure and H-induced modifications, increase in vol. and magnetic properties in relation to H concn., crit. behavior, diffusion and ordering of H, and formation of the hydrides at pressures of up to 20 GPa.
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