Materials Literature
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We have observed ferromagnetism in Li-doped ZnO nanorods with Curie temperature up to 554 K. Li forms shallow acceptor states in substitutional zinc sites giving rise to $p$-type conductivity. An explicit correlation emerges between increase in hole concentration with decrease in magnetization and Curie temperature in…
${({\text{LaNiO}}_{3})}_{n}/{({\text{SrMnO}}_{3})}_{2}$ superlattices were grown using ozone-assisted molecular beam epitaxy. In situ reflection high-energy electron diffraction and x-ray scattering has been used to characterize the structural properties of the superlattices, which are strained to the ${\text{SrTiO}}_…
We present a full analysis of the contrast mechanisms for the detection of ferroelectric domains on all ( x , y and z ) faces of bulk single crystals using scanning force microscopy. The experiments were carried out with hexagonally poled lithium niobate to ensure access to a well-defined domain structure on every cry…
Puzzling multiferroic behavior observed recently in spin-1/2 one-dimensional chain cuprate ${\text{LiCu}}_{2}{\text{O}}_{2}$ with edge-shared arrangement of ${\text{CuO}}_{4}$ plaquettes and incommensurate spiral spin ordering is consistently explained to be a result of the nonrelativistic exchange-induced electric po…
Autologous fibrin-based tissue-engineered heart valves have demonstrated excellent potential as patient-derived valve replacements. The present pilot study aims to evaluate the structure and mechanical durability of fibrin-based heart valves after implantation in a large-animal model (sheep). Tissue-engineered heart v…
Electron by electron: Beta-diketiminato nickel(I) complex fragments are capable of activating N(2) through coordination. The resulting complex can be reduced in two single-electron steps, which further activates the N-N bond. The picture shows the structure of the singly reduced complex with mu-eta(1):eta(1)-bound N(2…
We have investigated theoretically the adsorption of molecules onto graphene with divacancy defects. Using ab initio density-functional calculations, we have found that ${\text{O}}_{2}$, CO, ${\text{N}}_{2}$, ${\text{B}}_{2}$, and ${\text{H}}_{2}\text{O}$ molecules all interact strongly with a divacancy in a graphene…
We show that it is possible to prepare and identify ultra-thin sheets of graphene on crystalline substrates such as SrTiO(3), TiO(2), Al(2)O(3) and CaF(2) by standard techniques (mechanical exfoliation, optical and atomic force microscopy). On the substrates under consideration we find a similar distribution of single…
We propose to combine the advantages of graphene, such as easy tunability and long coherence times, with Josephson physics to manufacture qubits. If these qubits are built around a 0 and $π$ junction they can be controlled by an external flux. Alternatively, a d-wave Josephson junction can itself be tuned via a gate v…
While synthesizing the single crystals of novel materials is not always feasible, orienting the layered polycrystals becomes an attractive method in the studies of angular dependencies of inelastic scattering of x-rays or neutrons. Putting in use the Rietveld analysis of layered structures in novel manganites and cupr…
The dielectric response of ${\text{PbMg}}_{1/3}{\text{Nb}}_{2/3}{\text{O}}_{3}\text{\ensuremath{-}}35%{\text{PbTiO}}_{3}$ ceramics (close to the morphotropic phase boundary) from 100 Hz up to 100 THz was determined in a broad temperature range of 5--900 K. Two ceramics were studied and compared: coarse grain ceramics…
On the experimental side, ${\text{BaFe}}_{2}{\text{As}}_{2}$ without doping has been made superconducting by applying appropriate pressure (2--6 GPa). Here, we use a full-potential linearized augmented plane-wave method within the density-functional theory to investigate the effect of pressure on its crystal structure…
We use phase field simulations to study composites made of two different ferroelastics (e.g., two types of martensite). The deformation of one material due to a phase transformation can elastically affect the other constituent and induce it to transform as well. We show that the phase transformation can then occur abo…
The recently developed self consistent {\it ab initio} lattice dynamical method (SCAILD) has been applied to the high temperature bcc phase of La and Th which are dynamically unstable at low temperatures. The bcc phase of these metals is found to be stabilized by phonon-phonon interactions. The calculated high tempera…
The wave nature of electrons in low-dimensional structures manifests itself in conventional electrical measurements as a quantum correction to the classical conductance. This correction comes from the interference of scattered electrons which results in electron localisation and therefore a decrease of the conductance…
Abstract Insulating semiconducting conductors? The electronic properties of graphene can be tuned through molecular charge transfer, induced by organic electron donor (acceptor), TTF (TCNE, TCNQ), molecules. Such molecular‐charge‐transfer process has significant effects on optical and transport properties, in particul…
Well-aligned ultralong ZnO nanorod arrays with a length of 10 microm have been synthesized on glass substrates using a preheating hydrothermal method. The diameter of the nanorods is in the range from 50 to 80 nm, and the aspect ratio and alignment can be simply controlled by varying the preheating time. Based on the…
Iron sandwich on a tungstate bun: Two new polyoxotungstates with paramagnetic iron(III) heteroatoms (see structure, W blue, Fe yellow, O red) possess S=15/2 and S=5 ground states. Both compounds are single-molecule magnets, and the hexairon species shows large hysteresis (see picture) and quantum tunneling effects at…
Polymerase chain reaction (PCR) was realized on the surface of gold nanoparticles (NPs) as a tool for self-organization at nanoscale and as a step toward programmable production of sufficient quantities of functional metallic superstructures. The assembly is controlled by varying the density of the primer on the surfa…
Basics in Phase Morphologies of Multicomponent Polymer-Based Materials Phase Morphology Development in Polymer Blends References Phase Morphology Investigation: Microscopic Tools, Tips, and Selected Scanning Electron Photomicrographs Introduction Sample Preparation for Scanning Electron Micrography References Selected…