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Magnetic and Electronic Properties of Selected Rare-Earth Chromium Germanides Compounds

100%
Gil A., Makowska-Janusik M.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 2
385-387
EN
The ternary rare-earth compounds exhibit interesting physical and structural properties. These structures changing composition and stoichiometry change drastically their magnetic properties. Some of them, based on chromium germanides were studied experimentally concerning their magnetic properties and up to our knowledge they were never studied theoretically explaining nature of their magnetic behaviour. In the presented work the nature and mechanism of the magnetic and electronic properties of rare-earth chromium germanides is presented. The magnetic and electronic properties of RCrGe₂ and RCr_{0.3}Ge₂ (R = Tb, Dy, Ho or Er) were investigated theoretically applying plane-wave density functional theory/Perdew-Burke-Ernzerhof methodology. The computational investigations were performed for the stoichiometric and nonstoichiometric crystal structure with the space group Cmcm. The stoichiometry of the rare-earth chromium germanides compounds has significant effect on the magnetic properties of the investigated material. The theoretical predictions are compared to the experimentally obtained results.
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Photoinduced SHG in Push-Pull Chromophores 1,3-dithiol-2-yliedene Moieties Embedded in Photopolymer Matrices

61%
Migalska-Zalas A., Makowska-Janusik M., Kityk I., Sahraoui B., Salle M., Gorgues A.
Acta Physica Polonica A
|
2003
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vol. 103
|
issue 2-3
293-300
EN
Photoinduced optical second harmonic generation was demonstrated in the several dithiole chromophore molecules with different degree of acceptor function. Theoretical quantum chemical simulations and experimental photoinduced second harmonic generation measurements showed that additional aromatic rings within the dithiole chromophore molecule play an important role in the pump-power dependencies of the second harmonic generation. Varying the presence of the aromatic rings one can achieve substantially different photoinduced second-order nonlinear optical properties.
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