Materials Literature
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A phosphate glass embedded with PbSe semiconductor quantum dots (QDs) has been synthesized and investigated. Optical absorption spectra of PbSe spherical QDs have been studied both theoretically and experimentally. Theoretical analysis of the energy spectra and optical transitions has been carried out in the framework…
We study theoretically the collective orbital excitation called the orbital wave in the orbital ordered manganites. The dispersion relation of the orbital wave is strongly correlated with the static spin structure through the coupling between spin and orbital degrees of freedom. As a probe to detect the dispersion rel…
Development of long-range order in relaxor ferroelectrics [Pb(Mg 1/3 Nb 2/3 )O 3 ] 1- x -[PbTiO 3 ] x (PMN/ x PT) and Pb(Zn 1/3 Nb 2/3 )O 3 (PZN) has been investigated by neutron powder diffraction and birefringence along with transmission-electron and optical microscopies. The Rietveld analysis of PZN revealed that t…
We demonstrate the first three-dimensional simulations of bicontinuous spinodal decomposition of incompressible binary fluid mixtures in a confined geometry. We find that after an initial transient the thickness of a wetting layer L grows with time t as L ∼ t 1/3 by a diffusion process and later as L ∼ t by a hydrodyn…
Many layered metals such as quasi-two-dimensional organic molecular crystals show properties consistent with a Fermi-liquid description at low temperatures. The effective masses extracted from the temperature dependence of the magnetic oscillations observed in these materials are in the range, ${m}_{c}^{*}{/m}_{e}\ens…
Laser-induced chromism of amorphous WO3 thin films prepared by pulsed laser deposition (PLD) has been investigated. The original films could be colored from light brown to purple by a single pulse of KrF excimer laser irradiation at 248 nm and subsequently bleached to brown by a single pulse of Nd–yttrium–aluminum–gar…
Fullerenes and nanotubes are promising candidates in the development of nanodevices. Recently, a form of carbon nanotube torus structures has been observed. In this regard, we have investigated the geometries, electronic structures, and energetics of small carbon nanotube tori, using both the tight-binding and semiemp…
We present depolarized light scattering data of the glass former toluene as obtained from tandem Fabry–Perot interferometry and Raman scattering covering a frequency range 0.5 GHz<v<5000 GHz. A large temperature interval of the (supercooled) liquid (Tg=117 K<T<295 K) as well as of the glass…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Porous Crystal Formation from Polyoxometalate Building Blocks: Single-Crystal Structure of [AlO4Al12(OH)12(H2O)24][Al(OH)6Mo6O18]2((OH)· 29.5H2OJung-Ho Son, Hyuk Choi, and Young-Uk KwonView Author In…
A cyclic version of the Entner-Doudoroff pathway is used by Pseudomonas aeruginosa to metabolize carbohydrates. Genes encoding the enzymes that catabolize intracellular glucose to pyruvate and glyceraldehyde 3-phosphate are coordinately regulated, clustered at 39 min on the chromosome, and collectively form the hex re…
The structural organization of nitridic ceramics in the system Si/B/N/C on an intermediate length scale is studied using 29 Si{ 11 B} rotational echo adiabatic passage double resonance (REAPDOR) and 11 B{ 29 Si} rotational echo double resonance (REDOR) NMR spectroscopy. The experiments are performed on a 100% 29 Si en…
X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES) spectroscopy were used to characterize the oxygen species in perovskite-type La 1 - x Sr x CoO 3 - δ with x = 0 and 0.2. The XPS method used synchrotron radiation with variable excitation energies. XPS showed two kinds of oxygen sp…
Low-temperature resistivity of half-metals is investigated. To date it has been discussed that the one-magnon scattering process in half-metals is irrelevant for low-temperature resistivity, due to the fully spin-polarized electronic structure at the ground state. If one takes into account the non-rigid-band behavior…
The minimum time t required to form an amorphous spot in a crystalline film of Ge2Sb2Te5 with NaCl structure was investigated for various applied laser powers P. An elementary power law of the form P∝t−0.5 is observed for pulse lengths larger than 10 ns which shows that amorphization occurs as soon as the melting temp…
In the past it has been claimed that lamellar molybdenum disulfide ${\mathrm{MoS}}_{2}$ undergoes a deep structural transformation upon lithium intercalation. In the absence of accurate x-ray diffraction data, the structure of ${\mathrm{LiMoS}}_{2}$ is not clearly known, even if recent x-ray absorption spectroscopy re…
We report the synthesis and luminescence decay kinetics of 1.2-nm ${\mathrm{Mn}}^{2+}$-doped ZnS nanoclusters grown in reverse micelles. The preparation method produces small particles with narrow-size distribution and fluorescence bands near 400--450 nm and 585 nm. Time-dependent fluorescence decay measurements using…
Barium titanate $({\mathrm{BaTiO}}_{3})$ ultrafine powders have been prepared from a monomeric metallo-organic precursor through combined solid-state polymerization and pyrolysis. This particular preparation route enables an adjustment of the mean particle size in a wide range from a few nanometers up to micrometer si…
Conductivity and permittivity of the quasi-one-dimensionsional organic transfer salt $(\mathrm{TMTTF}{)}_{2}{\mathrm{PF}}_{6}$ have been measured at low frequencies ${(10}^{3}--{10}^{7}\mathrm{Hz})$ between room temperature down to below the temperature of transition into the spin-Peierls state. We interpret the huge…
Electronic structure calculations of ${\mathrm{LiB}}_{3}{\mathrm{O}}_{5},$ ${\mathrm{CsB}}_{3}{\mathrm{O}}_{5},$ and ${\mathrm{CsLiB}}_{6}{\mathrm{O}}_{10}$ crystals from first principles are performed based on a plane-wave pseudopotential method. The static second-harmonic generation (SHG) coefficients are calculated…
The effect of nitrogen addition on the properties of tetrahedral amorphous carbon (ta-C) has been studied. The ta-C is deposited by a filtered cathodic vacuum arc. The effect of introducing nitrogen on its plasma was measured by a retarding field analyzer and optical emission spectroscopy. The ta-C:N films were studie…