Materials Literature
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We study the focusing efficiency of multilevel diffractive lenses as a function of f-number. Both scalar and rigorous analyses are performed on two- and three-dimensional lenses. We show that shadowing in lenses with small f-numbers is a critical factor that limits their performance. We show further that scalar analys…
We propose an experimental method to confirm theoretical predictions concerning the detection of phase transitions in solids via the measurement of the chemical potential as a function of temperature. Here, as experimental evidence of the validity of these predictions, we perform indirect measurements of the chemical…
Temperature-dependent transport and magnetic measurements on ${\mathrm{Sr}}_{2}{\mathrm{Y}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{Co}}_{2}{\mathrm{O}}_{7}$ indicate that ferromagnetism appears along with a crossover between two forms of variable-range-hopping (VRH) conductivity on cooling. Efros-Shklovskii (ES)-type VRH co…
A detailed theoretical study of magnetic behavior of iron along the bcc-fcc (Bain's) transformation paths at various atomic volumes, using both the local spin-density approximation (LSDA) and the generalized gradient approximation (GGA), is presented. The total energies are calculated by the spin-polarized full-potent…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTMicrodomain-Tailored Crystallization Kinetics of Block CopolymersHsin-Lung Chen, Shu-Ching Hsiao, Tsang-Lang Lin, Kazuhiro Yamauchi, Hirokazu Hasegawa, and Takeji HashimotoView Author Information Department of Chemical Engineering, Nati…
We have performed first-principles calculations of Si/SiO$_2$ superlattices in order to examine their electronic states, confinement and optical transitions, using linearized-augmented-plane-wave techniques and density-functional theory. Two atomic models having fairly simple interface structure are considered; they d…
The interplay of the electron-phonon interaction and of the double- and superexchange magnetic effects is analyzed in the ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ perovskites with $0<x<0.5.$ By using an analytical variational scheme that allows us to treat the electron-phonon interac…
Based on the digitized electron micrographs, we investigate a temperature evolution of Co/C film. The simple in usage quantitative characterization of the spatial disorder for systems of point objects has been employed. We show that a dominant increase of spatial inhomogeneity of cobalt phase is shifted towards the la…
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Diffusion of deuterium in diamondlike carbon films with different Si contents deposited by a pulsed arc discharge method in deuterium atmosphere was studied. The concentration profiles of D were measured by secondary-ion-mass spectrometry and elastic-recoil-detection techniques. A model is proposed to describe the exp…
We report the results of a ${}^{51}\mathrm{V}$ and ${}^{69}\mathrm{Ga}$ nuclear magnetic resonance (NMR) study of ${\mathrm{Fe}}_{2}\mathrm{VGa}$ at temperatures between 4 and 450 K. The presence of magnetic antisite defects is deduced from the NMR linewidth, which displays a Curie-law temperature dependence. The abse…
The adsorption of CO on ${\mathrm{TiO}}_{2}(110)$ is investigated using the full-potential linearized-augmented-plane-wave method. The equilibrium structures of the clean and adsorbed ${\mathrm{TiO}}_{2}(110)$ surfaces are optimized through total-energy and atomic force calculations. Two geometries of CO absorption, n…
The atomic and electronic structure of the $[0001]/(1\ifmmode\bar\else\textasciimacron\fi{}2\ifmmode\bar\else\textasciimacron\fi{}30) \ensuremath{\Sigma}=7$ symmetric tilt boundary in ZnO has been investigated by an ab initio plane-wave pseudopotential method within the local-density approximation. Two types of equili…
A thermodynamic description of the Peltier heat at the aluminum and the oxygen electrode in the system NaF–AlF 3 –Al 2 O 3 is given. The thermoelectric power in melts with molar ratios n NaF / n AlF3 from 3.0 to 1.0, saturated with alumina are measured. Seebeck coefficients for molten fluoride electrolytes saturated w…
Recently, depletion forces were accounted for by a contraction of the description based on the integral equations theory of simple liquids [Phys. Rev. E 61, 4095 (2000)]. The extension of those results to the case of inhomogeneous systems is reported here. Besides, the energetic contributions to the wall-particle depl…
We perform Monte-Carlo simulations to obtain quantitative results for the anomalous Hall resistance, ${R}_{A},$ observed in colossal magnetoresistance manganites. ${R}_{A}$ arises from the interaction between the spin magnetization and topological defects via spin-orbit coupling. We study these defects and how they ar…
In a recent paper it has been proposed that the four-orbital model of Gouterman should be replaced by a new band assignment scheme for the MPc UV−visible absorption spectrum. Since this proposed assignment scheme would alter the basis for the spectral analysis of a wide range of complexes, its validity is tested again…
Lanthanide tris(beta-diketonates) formed stable, 1:1 highly coordinated complexes with amino alcohols, and the resulting complexes exhibited large enhanced fluorescence and intense induced circular dichroism (CD) signals. The stability constants of the highly coordinated complexes were determined for various combinati…
A novel one-step soft solution-processing route called the solvothermal-copolymerization technique was successfully developed for in situ fabrication of polystyrene (PS)/CdS nanocomposites embedded with CdS nanowires in ethylenediamine media at lower temperatures (80−140 °C). In this route, the polymerization of the m…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.