Materials Literature
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Bi ( Fe 1 ∕ 2 Cr 1 ∕ 2 ) O 3 , a recently proposed candidate multiferroic perovskite, is prepared in a bulk form by high pressure solid-state synthesis. The material is isostructural with polar BiFeO3 but is paramagnetic at room temperature due to disorder of the Fe3+ and Cr3+ cations on the B site. Mössbauer and magn…
Abstract A model for the prediction of faceted crystal shape evolution during growth or dissolution is presented. An ab initio mechanistic model for the relative growth or dissolution rates is also described for organic molecular crystal systems. The shape evolution model proves that while growing crystals evolve towa…
Two distinct, stable alignment states have been observed for a nematic liquid crystal confined in a layer with thickness of 12μm and in square wells with sides of length between 20 and 80μm. The director lies in the plane of the layer and line defects occur in two corners of the squares. The positions of the defects d…
The $R3m\text{\ensuremath{-}}R3c$ transition is in a limited phase field in the $\mathrm{Pb}({\mathrm{Zr}}_{1\ensuremath{-}x},{\mathrm{Ti}}_{x}){\mathrm{O}}_{3}$ (PZT) phase diagram and is a ferroelectric-ferroelectric phase transition that involves the coupling of a secondary displacive ferroelastic phase transition,…
Golden cage: The two smallest anionic gold cages, Au16− and Au17−, are doped with a Cu atom to give the cluster anions CuAu16− (see picture) and CuAu17−, respectively. The photoelectron spectra of CuAu16− and CuAu17− suggest that the doping does not alter the structures of the parent cages. Theoretical studies confirm…
To clarify the size effect in semiconductor nanowires with decreasing diameters but not yet reaching the quantum confinement region, single crystalline zinc oxide nanowires with diameters around 10nm are synthesized. Electrical transport measurements of these thin nanowires show significant increase in conductivity ac…
In this work a Mn doped magnetoelectric BiFeO 3 system is studied. X-ray diffraction (XRD), scanning electron microscopy, energy dispersive x-ray analysis (EDX), Mössbauer spectroscopy at room and high temperatures, differential scanning calorimetry (DSC), high temperature magnetization, dielectric constant measuremen…
The geometry of crescent-shaped noble-metal nanoparticles is systematically varied in terms of shape and size. The resulting changes in the plasmonic resonances of these structures are investigated by extinction spectroscopy revealing a rich polarization-dependent response in the near-infrared region of the electromag…
The authors have studied the magneto-optical and magnetotrasnport properties of Ga1−xMnxAs thin films with high Mn concentrations (x=12.2%–21.3%) grown by molecular-beam epitaxy. These heavily Mn-doped GaMnAs films were formed by decreasing the growth temperature to as low as 150–190°C and by reducing the film thickne…
The search for efficient semiconductor thermoelectrics has been greatly aided by theoretical modeling of electron and phonon transports in bulk materials and nanocomposites. Recent experiments have studied thermoelectric transport in thermoelectrics that are “strongly correlated” and derived by doping Mott insulators.…
Bismuth sulfide thin films have been assembled by cross-linkage nanorods on surface-functionalized Si substrate with self-assembled monolayers. Results of transmission electron microscopy and electron diffraction revealed that highly crystalline Bi2S3 nanorods grow along c-axis direction. Electrical transport properti…
Aiding and abetting a wanted radical: The neutral phosphorus radical [.P{NV[N(Np)Ar]3}2] (Np=neopentyl, Ar=3,5-Me2C6H3) exists as a monomer in the solid state and is resonance-stabilized by two nitridovanadium trisanilide metalloligands through the VIV/VV redox couple (see EPR trace and calculated SOMO of [.P{NV[N(Me)…
Abstract In the present investigation, we have synthesized a polypyrrole films by chemical polymerization technique for the development of ammonia sensor. The polypyrrole films were synthesized in an aqueous acidic medium on glass substrate with mild oxidation of ferric chloride at temperature 29°C. The concentrations…
We apply the Lindstedt method to the one dimensional Fermi-Pasta-Ulam $β$ lattice to find fully general solutions to the complete set of equations of motion. The pertubative scheme employed uses $ε$ as the expansion parameter, where $ε$ is the coefficient of the quartic coupling between nearest neighbors. We compare o…
We propose and analyze a four-terminal metal-semiconductor device that uses hot-electron transport through thin ferromagnetic films to inject and detect a charge-coupled spin current transported through the conduction band of an arbitrary semiconductor. This provides the possibility of realizing a spin field-effect-tr…
In quasi-magnetic tunnel junctions (QMTJs) with a EuS spin filter tunnel barrier between Al and Co electrodes, we observed large magnetoresistance (MR). The bias dependence shows an abrupt increase of MR ratio in high bias voltage, which is contrary to conventional magnetic tunnel junctions (MTJs). This behavior can b…
Abstract Drawing of semi‐crystalline polymers generally involves a necking phenomenon, which is often referred to as plastic instability. The draw ratio in the stable neck is called natural draw ratio . A review is made of papers dealing with the phenomenology of necking and endeavors to identify its physical origin.…
It is shown that the elastic energy far from a point defect in an isotropic solid is mainly shear elastic energy. The calculation, which is based on a standard dipole expansion, shows that less than 10% of the distant point defect energy is associated with volume changes, no matter how large or small the bulk modulus…
The spin Hall effect does not generally result in a charge Hall voltage. We predict that in systems with inhomogeneous electron density in the direction perpendicular to main current flow, the spin Hall effect is instead accompanied by a Hall voltage. Unlike the ordinary Hall effect, we find that this Hall voltage is…
In order to probe the magnetic ground state, we have carried out temperature dependent magnetic Compton scattering experiments on an oriented single crystal of magnetite (Fe$_3$O$_4$), together with the corresponding first-principles band theory computations to gain insight into the measurements. An accurate value of…