Materials Literature
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A systematic study of NaxCoO2 (x=0.50 - 0.90) and NaxCoO2 yH(D)2O (x=0.26 - 0.42, y=1.3) has been performed to determine phase stability and the effect of hydration on the structural and superconducting properties of this system. We show that a careful control of the Na deintercalation process and hydration dynamics i…
We study the cooperative rupture of multiple adhesion bonds under shared linear loading. Simulations of the appropriate Master equation are compared with numerical integration of a rate equation for the mean number of bonds and its scaling analysis. In general, force-accelerated rupture is rather abrupt. For small clu…
This paper extends the stability calculations carried out for a spherical particle [Eur. Phys. J. B, vol. 37 (2004) or arXiv: cond-mat/0401404] to the case of a cylindrical inclusion.
Abstract The derivation of a new condition for characterizing isotropic dielectric‐magnetic materials exhibiting negative phase velocity, and the equivalence of that condition with previously derived conditions, are presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 315–316, 2004; Published onlin…
The scaling capability of chalcogenide-based phase-change memory (PCM) is discussed. Experimental and numerical results are presented, showing that the reset current scales down with the device contact area, reaching values as low as 50 /spl mu/A. The impact of thermal cross-talk between adjacent bits is investigated,…
We demonstrate the negative refraction of microwaves in a metallic photonic crystal prism. The spectral response of the photonic crystal prism, which manifests both positive and negative refraction, is in complete agreement with band-structure calculations and numerical simulations. The validity of Snell's law with a…
With the increasing challenge of scaling floating gate nonvolatile memory technology to beyond 65 nm, alternative memory technologies are being investigated. Chalcogenide based phase change memory (R. Neale et al, Electronics, p56-60, 1970) is one of the alternative memory candidates. In this review, the physics and o…
Heusler alloys, such as ${\mathrm{Co}}_{2}\mathrm{MnSi}$ and ${\mathrm{Co}}_{2}\mathrm{MnGe},$ have been predicted from first--principles to be half metallic and potential candidates for spintronic applications. However, spin polarizations of only 50--60 % were experimentally obtained for these compounds---a decrease…
Amorphous Ge x Se1− x , x = 0.22–0.28 thin films were prepared by the pulsed-laser deposition technique. The photo-induced and thermally induced changes of structure and optical gap of the films were studied and discussed. The exposure and annealing causes bleaching of the films, and increases. The structure is influe…
Although production of nanowires from various materials is proving very successful, the development of diamond nanowires has been slow. However, a significant amount of successful research has been conducted regarding zero-dimensional nanodiamond crystals, which may offer a basis for the development of one-dimensional…
Local atomic structures around the Lu3+ ion in a 0.1 mol% LuO1.5-doped fine-grained Al2O3, in which the doped Lu3+ ions segregate to the grain boundaries, was characterized by Lu L3-edge X-ray absorption fine structure. Structural parameters in LuO1.5-doped Al2O3 were determined by a curve-fitting method, and the resu…
A theoretical model is suggested which describes the strengthening of nanocrystalline materials due to the effects of triple junctions of grain boundaries as obstacles for grain-boundary sliding. In the framework of the model, a dependence of the yield stress characterizing grain-boundary sliding on grain size and tri…
We present a theoretical study of the elementary electronic excitation associated with plasmon modes in a two-dimensional hole gas (2DHG) in the presence of spin-orbit (SO) interaction induced by the Rashba effect. The calculation is carried out using a standard random-phase-approximation approach. It is found that in…
Thermochemical characteristics of Nd1+xBa2-xCu3Oy solid solutions were studied by solution calorimetry. Dependences of formation enthalpies from Nd content were constructed. It was established that decomposition of solid solution on the basis of Nd123 phase took place both in inert and in oxygen atmosphere. As a resul…
Direct elastic deformation measurements taken during polarization reversal in 111 oriented 0.955 Pb(Zn1/3Nb2/3)O3–0.045 PbTiO3 single crystals confirm the observation by W. Cao [Ferroelectrics 290, 107 (2003)] that a ferroelastic reorientation of the domain polarization vectors is involved, and the observed strain cha…
properties of these particles are distinct from those of the bulk phase and those of isolated atoms and molecules. The specific properties of nano-sized metal particles in catalysis are usually associated with a change in their electronic properties relative to the bulk samples. This change is a result of size effects…
A systematic investigation on the unusual attachment of labile deuterium to carbon nanotubes in deuterated water and alcohols is reported. The carbon nanotubes were solubilized through the established functionalization of the nanotube-bound carboxylic acids to allow solution-phase reaction and characterization. The de…
We describe a series of new aregic polyamides of the AABB-type by polycondensation reaction of pentachlorophenyl 2,3,4,5-tetra- O -methyl- d -mannarate or pentachlorophenyl 2,3,4,5-tetra- O -methylgalactarate with different diamines. Fully sugar-based polyamides have been prepared from the aldaric esters and the dihyd…
Leakage mechanisms of low-dielectric constant (low-k) carbon-doped silicon oxide (SiOC) were investigated in Cu damascene structure integrated with amorphous SiC or SiN as Cu diffusion barrier at low electric fields (0–1.36 MV/cm) and various temperatures (25–250 °C). Conduction mechanisms of SiOC integrated with SiC…
We report a systematic study of the transport properties of pulsed-laser-deposited NiMnSb films on silicon as a function of film thickness. A low-temperature upturn is observed in the resistivity for film thicknesses of 130 nm and below. The resistivity minimum corresponds to the maximum in the positive magnetoresista…