Materials Literature
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The magnetic properties of electron-doped manganite La0.3Ca0.7MnO3 and La0.3Ca0.7Mn0.8Cr0.2O3 polycrystalline samples prepared by sol-gel technique have been investigated between 5 and 300 K in magnetic fields ranging from 0 to 5 T. The transition at 260 K, attributed to charge ordering in La0.3Ca0.7MnO3, is completel…
Correlation effects of an electron gas in an external potential are derived using an Effective Action functional method. Corrections beyond the random phase approximation (RPA) are naturally incorporated by this method. The Effective Action functional is made to depend explicitly on two-point correlation functions. Th…
We investigate theoretically the progressive coating of C60 by several sodium atoms. Density functional calculations using a nonlocal functional are performed for NaC60 and Na2C60 in various configurations. These data are used to construct an empirical atomistic model in order to treat larger sizes in a statistical an…
Single crystal growth of several rare earth hexaborides has been carried out by the floating zone technique. A high power Xenon arc lamp image furnace was used for the crystal growth. Large high quality crystals of LaB$_{6}$, CeB$_{6}$, PrB$_{6}$ and NdB$_{6}$, about 1 cc in volume have been obtained. Crystals of all…
Abstract Die Organisation von Nanostrukturen über mehrere Längenskalen ist eine Schlüsselherausforderung im Design von integrierten Materialien mit verbesserten Funktionen. Derzeitige Ansätze greifen bevorzugt auf physikalische Methoden wie Musterbildung zurück, und nicht auf Methoden wie spontane chemische Selbstorga…
We explore a possible application of the additive generalization of the Boltzmann-Gibbs-Shannon entropy proposed in [A.N. Gorban, I.V. Karlin, Phys. Rev. E, 67:016104 (2003)] to fully developed turbulence. The predicted probability distribution functions are compared with those obtained from Tsallis' entropy and with…
We have investigated the magnetic properties of nanocrystalline LaCo0.5Mn0.5O3. The temperature dependence of the imaginary part of the a.c. susceptibility shows a strongly frequency dependent maximum at a temperature, Tf, which is well below the ferromagnetic transition temperature (TC ~ 230 K). The frequency depende…
A 1% Pt/CeO 2 catalyst prepared by the solution combustion method shows a higher catalytic activity for CO oxidation by O 2 compared to Pt metal particles. At least six hydrogen atoms are taken up per Pt at −25 °C. The structure of 1% Pt/CeO 2 catalyst has been investigated by X-ray diffraction (XRD), transmission ele…
The organization of nanostructures across extended length scales is a key challenge in the design of integrated materials with advanced functions. Current approaches tend to be based on physical methods, such as patterning, rather than the spontaneous chemical assembly and transformation of building blocks across mult…
This study presents a method of extracting 3D metrological information for etched gate structures from top-down SEM images for use in critical dimension analysis. The variations in sidewall angle and bottom corner roundness are quantified as feature indices by multiple parameter profile characterization (MPPC), and ar…
The colloidal short-time self-diffusivity D(s)(s)(phi) is significantly retarded relative to hard sphere suspensions for the case of interparticle potential interactions induced by a nonadsorbing polymer. A comparison of diffusing wave spectroscopy measurements with direct calculations of D(s)(s)(phi) demonstrates tha…
The possibility of spontaneous periodic distortions, depending on the tilt angle in a nematic liquid crystal sample, is investigated by means of a general formulation of the stability problem. It is shown that due to the presence of a surfacelike term in the free-energy density, the uniform pattern can be destabilized…
Scatterometry provides a new, vibration-tolerant technique of overlay metrology. Gauge repeatability and reproducibility is improved by an order of magnitude over imaging-based overlay metrology. To measure the overlay of patterned layers A and B by scatterometry, one line grating is placed in layer A and another in l…
Neutron-diffraction experiments were performed on ball-milled amorphous selenium. The structure factor of the material was interpreted by means of reverse Monte Carlo (RMC) modeling. In addition, detailed RMC studies were carried out on numerous sets of diffraction data previously reported for amorphous Se. Based on t…
Abstract In order to develop the solid-state laser oscillator based on laser dye compound, the intercalation of rhodamine 6G (R6G) together with cetyltrimethylammonium cations (CTA+) into montmorillonite (Mont) interlayer space was investigated. It was found that the solid material with the light-emitting ability was…
Charge ordering phenomena and their effects on charge dynamics have been investigated for single crystals of ${R}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{NiO}}_{4}$ $(R=\mathrm{La},$ Nd) with $x=0.5$ for $R=\mathrm{La}$ and $0.33<~x<~0.70$ for $R=\mathrm{Nd}$ by measurements of neutron diffraction and optica…
The effects of metals and petroleum hydrocarbons on benthic marine diatom communities were assessed using a manipulative field experiment at Casey Station, Antarctica. Uncontaminated, metal contaminated, and petroleum hydrocarbon contaminated sediments were deployed for 11 weeks during the 1999 austral summer. The tre…
Electron and hole states of multishell CdS/HgS/CdS quantum-dot quantum-well nanocrystals are determined by use of atomistic tight-binding theory. Single-particle energies, symmetries and charge densities, trapping in the internal quantum well, transition energies, and optical spectra are determined. Comparison with ex…
The ability of a critical dimension scanning electron microscope (CD-SEM) to resolve differences in the widths of two lines is determined by measurement repeatability and any sample-dependent biases. In order to ascertain the dependence of these quantities upon eight different parameters specifying the sample geometry…
Scatterometry is a contender for various measurement applications where structure widths and heights can be significantly smaller than 70 nm within one or two ITRS generations. For example, feedforward process control in the post-lithography transistor gate formation is being actively pursued by a number of RIE tool m…