Materials Literature
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Synthetic diamond crystals grown using a solvent catalyst that contains Ni were studied by optical detection of electron paramagnetic resonance (ODEPR) using the magnetic circular dichroism of the optical absorption (MCDA). The MCDA spectra in the infrared spectral region consist of a derivative-like line at 1.06 eV,…
GaAs epitaxially grown on porous Si (PS) showed the presence of wires with typical diameters of 60 nm, and lengths in the range 6-10 . The Raman spectra of these samples were studied, and we focused attention on two additional modes appearing as `shoulders' to the LO and TO GaAs lines. The former could be assigned to…
We have grown thin stable films of a good metal, Ag, that have characteristics of bad metals: high resistivity, strong temperature dependence of resistivity, and lack of resistive saturation. For films of different thickness, the temperature-dependent resistance and the Hall effect resistance provide evidence that the…
Bis zu 14 Porphyrinringe enthalten die Titelverbindungen 1, die einfach und regioselektiv aus linearen Nickel-Zink-Porphyrinoiden zugänglich sind. Nach Bestrahlung mit Licht findet ein rascher Energietransfer von den äußeren Porphyrinringen auf die zentrale Diporphyrineinheit statt.
Patterning characteristics of indium tin oxide thin films using different wavelengths of a diode-pumped Q-switched Nd:YLF and a flashlamp-pumped Nd:YAG laser have been studied. While a ripplelike structure in the etched line was formed due to incomplete material removal when the first harmonic of the Nd:YLF or Nd:YAG…
Atomic-resolution Z-contrast images demonstrate unambiguously that the annealed, metalorganic chemical vapor deposition derived transparent In2O3–ZnO films have a polytypoid microstructure, consisting of ZnO slabs of variable width separated by single In–O octahedral layers. These In–O layers induce a polarity inversi…
The search for better, more efficient and at the same time more transparent NLO chromophores has led to the development and investigation of new, alternative chromophore types. A new and quite general synthetic route to ring-substituted truxenones is presented, and the linear and nonlinear optical and redox properties…
Perovskite manganese oxide materials known for the phenomenon of colossal magnetoresistance often exhibit anomalously large 1/f noise and large, temperature-dependent ferromagnetic resonance (FMR) linewidths. We show that in epitaxial films, these anomalies are very sensitive to oxygen partial pressure during film gro…
Neutron scattering investigations of the paramagnetic correlations in the layered manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$, which exhibits colossal magnetoresistance above the Curie transition at ${T}_{C}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}112\mathrm{K}$, show…
Magnetic Langmuir–Blodgett films containing well-organized monolayers of single-molecule magnets are reported. The single-molecule magnets in question are high-spin molecular clusters of the type [Mn12O12(carboxylate)16]. The structure of such multilayered inorganic–organic composites is depicted schematically in the…
The Mott-Hubbard insulator $(\mathrm{TMTTF}{)}_{2}{\mathrm{PF}}_{6}$ is well known to have a spin-Peierls ground state at ambient pressure below 18 K, although antiferromagnetic order is stabilized for $P>{P}_{c}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.9$ GPa hydrostatic pressure. Near ${P}_{c}$, the tr…
Depletion-driven self-assembly in binary colloidal mixtures is studied via the time evolution of the cluster-size distribution and structure factor as the mixtures equilibrate after shear melting. The data suggest a two-stage crystallization process governed by an initial collapse into an amorphous metastable state, t…
Amorphous carbon films with variable sp3 content were produced by ArF (193 nm) pulsed laser deposition. Electron energy loss spectroscopy and spectroscopic ellipsometry were employed to systematically study changes in the bonding and optical properties of the carbon films as a function of the kinetic energy of ablated…
Transient absorption spectra of ion-implanted Si nanocrystals (NCs) exhibit two picosecond photoinduced absorption features, attributed to carriers in NC quantized states (high-energy band) and Si/SiO2 interface states (low-energy band). Fast relaxation of the high-energy band indicates that populations of quantized s…
The ability of novel tetraazatriphenylenes to sensitise the luminescence of different lanthanide ions is reported. An example of the type of lanthanide complex formed is depicted. The influence of the ligand–structure variation on the absorption characteristics and other photophysical properties of the sensitiser was…
We have measured the photoelectron spectra of mass-selected negatively charged mercury clusters ${\mathrm{Hg}}_{n}^{\ensuremath{-}}$ in the size range $n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3--250$. The spectra are characterized by gaps which shrink with increasing $n$. These gaps represent the $s\ensure…
The low carrier mobility of the magnetic perovskite ${\mathrm{Nd}}_{0.52}{\mathrm{Sr}}_{0.48}{\mathrm{MnO}}_{3}$ implies that the dominant conductivity mechanism is related to Mott hopping. We propose a modification of Mott's original model by taking into account that the hopping barrier depends on the misorientation…
Two versatile luminescence ion probes for potassium ions have been designed based on the “switching on and off” of the gold–gold interaction. Addition of potassium ions to the gold(I) complexes [Au2(R2PCH2PR2)(S-benzo[15]crown-5)2] (see the picture; R=Ph, cyclohexyl; M+=K+) give rise to an intense red luminescence.
Molecular recognition and electrostatic interaction of oppositely charged polyelectrolytes are combined in the fabrication of ultrathin metallosupramolecular multilayers [shown schematically in the picture, PEI=polyethyleneimine, PSS=poly(styrene sulfonate)]. The layers between the PSS layers are composed of an iron(I…
Homoepitaxial growth is unstable towards the formation of pyramidal mounds when interlayer transport is reduced due to activation barriers to hopping at step edges. Simulations of a lattice model and a continuum equation show that a small amount of desorption dramatically speeds up the coarsening of the mound array, l…