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First principle calculations of alkali hydride electronic structures
(Journal of Physics: Condensed Matter, 2007)
Electronic structure, volume optimization, bulk moduli, elastic constants, and frequencies of the transversal optical vibrations in LiH, NaH, KH, RbH, and CsH are calculated using the full potential augmented plane wave ...
Spin glass formation in Li-substituted Co2TiO4 spinel
(Journal of Physics: Condensed Matter, 2004)
DC magnetization and AC susceptibility measurements point to the formation of a spin glass state in the ternary spinel-type compounds Li1.33xCo2-2xTi1+0.67xO4. The dynamics of spin freezing was analysed with both the ...
Solitons in the system of interacting Frenkel excitons
(Journal of Physics: Condensed Matter, 2000)
The possible formation of solitons in a Frenkel exciton system, with exciton-exciton interaction only, is studied taking into account the Pauli character of exciton operators. This is realized by choosing the trial function ...
Raman spectroscopy of impurity states in gallium-doped PbTe
(Journal of Physics: Condensed Matter, 2000)
We present Raman spectra and results of galvanomagnetic measurements of PbTe single crystals, doped with gallium, between 10 and 300 K. The effect of persistent photoconductivity depends on the gallium concentration. In ...
X-ray powder diffraction line broadening analysis and magnetism of interacting ferrite nanoparticles obtained from acetylacetonato complexes
(Journal of Physics: Condensed Matter, 2005)
A study of the microstructures and magnetic properties of nanosize Zn ferrite (ZnFe2O4), Mn ferrite (MnFe2O4), and the cation deficit Zn-Mn ferrites Zn0.70Mn0.23Fe1.89O4 (S1), Zn0.41Mn0.50Fe1.84O4 (S2) and Zn0.18Mn0.67Fe1.85O4 ...
Optical and electron paramagnetic resonance spectroscopy of Cd1-xMnxS quantum dots
(Journal of Physics: Condensed Matter, 2004)
Cd1-xMnxS quantum dots (QDs) with diameter d less than or equal to 4.5 nm and with manganese concentrations from x = 0.001 to 0.15 have been prepared using aqueous solution precipitation. Absorption and fluorescence spectra ...
Ce1-xY(Nd)(x)O2-delta nanopowders: potential materials for intermediate temperature solid oxide fuel cells
(Journal of Physics: Condensed Matter, 2006)
Nanopowdered solid solution Ce1-xY(Nd)(x)O2-delta samples ( 0.1 LT = x LT = 0.25) were made by self-propagating room temperature (SPRT) synthesis. The first-order Raman spectra of Ce1-xY(Nd)(x)O2-delta samples measured at ...
Interference effect between superparamagnetic and spin glass correlated moments in a system of dispersed Co3O4 nanocrystallites
(Journal of Physics: Condensed Matter, 2009)
An inhomogeneous system of aggregates of Co3O4 nanocrystallites dispersed in an amorphous SiO2 matrix has been studied. X-ray diffraction and atomic force microscopy reveal a bimodal distribution of crystallite sizes, ...
Ferromagnetic properties of the Zn-Mn-Osystem
(Journal of Physics: Condensed Matter, 2008)
Polycrystalline Zn -Mn -O samples with nominal manganese concentration x = 0.01 and 0.10 were synthesized by a solid state reaction route using (ZnC(2)O(4) center dot 2H(2)O)(1-x) and (MnC(2)O(4) center dot 2H(2)O)(x). ...
Properties of the moving Holstein large polaron in one-dimensional molecular crystals
(Journal of Physics: Condensed Matter, 2009)
The features of the moving large polaron are investigated within Holsteins molecular crystal model. The necessity to account for the phonon dispersion is emphasized and its impact on polaron properties is examined in detail. ...