Materials Literature
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Motivated by a study of various experiments describing the electronic and magnetic properties of the diluted magnetic semiconductor ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As},$ we investigate its physical response in detail using a combination of first-principles band structure with methods based on…
To contribute to the development of single-component molecular metals, several nickel complexes with cyclohexeno-condensed or ethylenedioxy-substituted TTF (tetrathiafulvalene) dithiolate ligands, (R(4)N)(n)[Ni(chdt)(2)] [R = Me, n = 2 (1); R = (n)Bu, n = 1 (2); n = 0 (3)] and (R(4)N)(n)[Ni(eodt)(2)] [R = Me, n = 2 (4…
The dynamical properties of an extended Hubbard model, which is relevant to quarter-filled layered organic molecular crystals, are analyzed. We have computed the dynamical charge correlation function, spectral density, and optical conductivity using Lanczos diagonalization and large-$N$ techniques. As the ratio of the…
Raman scattering is used to study the pressure-dependence of the radial (R) bands of bundled single-walled carbon nanotubes (SWNT) produced by the HiPCO process. We find that the normalized pressure derivative of the R-band frequency, $\ensuremath{\Phi}=d(\mathrm{ln}{\ensuremath{\omega}}_{\mathrm{R}})/dP,$ increases w…
The review concerns the state-of-the-art in studies on the magnetic chemistry of exchange clusters (polynuclear transition-metal complexes in which the unpaired electrons of particular sites are involved in magnetic exchange due to both direct or indirect, via bridging ligands, interactions of their wave functions). P…
We report low-temperature transport measurements on suspended single-walled carbon nanotubes (both individual tubes and ropes). The technique we have developed, where tubes are soldered on low-resistive metallic contacts across a slit, enables a good characterization of the samples by transmission electron microscopy.…
Electronic states of a material are intimately related to the dimension of the system. Epitaxial layers of transition metal dichalcogenides provide model systems in which the dimension can gradually be reduced by varying the film thickness. Applying combined angle-resolved photoemission and inverse photoemission on bu…
Experimental data from various authors on the graphite melting point are reviewed and compared with the results obtained by E I Asinovskii, A V Kirillin, and A V Kostanovskii as presented in their paper 'Experimental investigation of the thermal properties of carbon at high temperatures and moderate pressures' (Usp. F…
The self-assembling tendency and protein complexation capability of dyes related to Congo red and also some dyes of different structure were compared to explain the mechanism of Congo red binding and the reason for its specific affinity for beta-structure. Complexation with proteins was measured directly and expressed…
Pure-silica-zeolite (PSZ) BEA film was prepared on stainless steel substrates by in situ crystallization at 130 °C for 14 days using a gel composition of 0.6:0.6:1:9.8 (TEA)OH−HF−SiO 2 −H 2 O. The film is polycrystalline, continuous, and about 15 μm thick. The film was characterized by X-ray diffraction (XRD), thermog…
Hydrothermally stable mesoporous ethanesilica with a long-range hexagonal order ( p 6 mm ) and a relatively thick and micropore-free framework wall was synthesized by the core−shell approach using a nonionic PEO−PLGA−PEO triblock copolymer template and a 1,2-bis(triethoxysilyl)ethane (BTESE) organosilica precursor. Th…
Two new isostructural mixed-metal phosphates, BaTeMO(4)(PO(4)) (M = Nb(5+) or Ta(5+)), have been synthesized as bulk phase powders and single crystals by standard solid-state techniques using BaCO(3), TeO(2), Nb(2)O(5) (or Ta(2)O(5)), and NH(4)H(2)PO(4) as reagents. The materials have novel layered crystal structures…
We have performed theoretical studies of the solubility within ${(M}_{x}{M}_{2\ensuremath{-}x}^{\ensuremath{'}})\mathrm{AlC},$ where $M$ and ${M}^{\ensuremath{'}}=\mathrm{Ti},$ V, and Cr by means of ab initio total energy calculations. The theoretical values of equilibrium volume and the optimized c/a ratios are in go…
Molybdenum oxide thin films find diverse applications as catalysts, gas sensors, and electrochromic devices. Such films are produced mainly by reactive sputtering and thermal evaporation but other techniques such as chemical vapor deposition and electrochemical deposition have been used. In the present work, the feasi…
The authors previously described a model of tissue engineering in rats that involves the insertion of a vascular pedicle and matrix material into a semirigid closed chamber, which is buried subcutaneously. The purpose of this study was to develop a comparable model in mice, which could enable genetic mutants to be use…
We present femtosecond transient absorption measurements on $\ensuremath{\pi}$-conjugated supramolecular assemblies in a high-pump-fluence regime. $\mathrm{Oligo}(p\ensuremath{-}\mathrm{p}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{y}\mathrm{l}\mathrm{e}\mathrm{n}\mathrm{e}\mathrm{v}\mathrm{i}\mathrm{n}\mathrm{y}\mathrm{l}\…
We describe a defect in pentacene single crystals that is created by bias stress and persists at room temperature for an hour in the dark but only seconds with 420nm illumination. The defect gives rise to a hole trap at Ev + 0.38eV and causes metastable transport effects at room temperature. Creation and decay rates o…
Optical orientation in the strained semiconductor superlattices is investigated theoretically. The dependence of the features in spin-polarization spectra on the structure parameters is clarified. The value of polarization in the first polarization maximum in the SL structures is shown to grow with the splitting betwe…
We show that optical and electrical measurements on pentacene single crystals can be used to extract the density of states in the HOMO-LUMO bandgap. It is found that these highly purified crystals possess band tails broader than those typically observed in inorganic amorphous solids. Results on field effect transistor…
We present here an efficient method which systematically reduces the rank of the augmented space and thereby helps to implement augmented space recursion for any real calculation. Our method is based on the symmetry of the Hamiltonian in the augmented space and keeping recursion basis vectors in the irreducible subspa…