Materials Literature
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The present paper reports the steady-state and transient photoconductivity (${\ensuremath{\sigma}}_{\mathrm{ph}}$) in amorphous thin films of ${\mathrm{Ge}}_{\mathrm{x}}$${\mathrm{Se}}_{100\mathrm{\ensuremath{-}}\mathrm{x}}$. It is observed that the photosensitivity (${\ensuremath{\sigma}}_{\mathrm{ph}/{\ensuremath{\s…
Prolonged exposure to strongly absorbed light increases the ac conductivity (${\ensuremath{\sigma}}_{\mathrm{ac}}$) of well-annealed amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ films, suggesting that new localized states are induced in the band gap. This change is enhanced by low-temperature illumination. Although…
To understand the isotope effect in the ferroelectric phase transition of CsH 2 PO 4 and CsD 2 PO 4 , a quasi-one-dimensional model is proposed. In contrast to the existing models which consider only either the proton's degree of freedom or the polarization dipoles, both of them are regarded as essential elements of t…
The phonon dispersion relations in ferromagnetic Invar alloys, Fe 3 Pt and Fe 65 Ni 35 , have been measured along the high-symmetry directions. The temperature as well as wave number ( q ) dependence of the phonon frequency shift, the linewidth in [110] TA 1 mode, have been observed. The results of these observations…
The electronic states of AlN with excitation energies below about 35 000 cm−1 have been studied at the CASSCF and MRCI levels of theory. Less elaborate calculations have been performed for the low-lying states of AlN+. Although the results are not definitive, they strongly suggest a 3Π ground state for AlN with a very…
The reversible disordering transition of the Ge(111) surface near 1050 K (160 K below the bulk melting temperature) has been studied by low-energy electron diffraction (LEED). Measurements were made using a position-sensitive detection system with the following characteristics: maximum speed, ${10}^{5}$ electrons/sec;…
[C 2 H 10 N 2 ] [CuBr 4 ] cristallise dans P2 1 /a avec a=7,511, b=7,803 et c=8,334 A, β=92,12 o , Z=2; affinement jusqu'a R=0,0392. [C 3 H 12 N 2 ] [CuBr 4 ] cristallise dans P2 1 /n avec a=8,086, b=7,566 et c=17,622 A, β=96,75 o , Z=4; affinement jusqu'a R=0,0359
Applying angle-resolved inverse photoemission to cleaved GaAs(110), we have measured the energy dispersion of the unoccupied surface-state bands along the \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{}--X\ifmmode\bar\else\textasciimacron\fi{} and \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{}--X\…
CO adsorption on clean and S-covered Pt(111) was studied using temperature programmed desorption (TPD), electron stimulated desorption ion angular distribution (ESDIAD), LEED, and work function measurements. Special attention was paid to comparing the CO adsorption rate, binding energy, and soft bending modes on a cle…
We study the structural properties, single-particle dynamics, and the charge transport in superionic and molten Ag2Se using the method of molecular dynamics. The calculations are based on a model of interionic potentials in which the ions interact through Coulomb interaction, steric repulsion, and charge–dipole intera…
Electrical resistance, R , Young's modulus, E and internal friction, Q -1 in (TaSe 4 ) 2 I were measured simultaneously as functions of temperature and dc-electric field strength, using a resonant flexural vibration technique. The CDW elasticity around the phase transition was investigated, and the predicted scaling r…
Grazing-incidence x-ray scattering (GIXS) techniques have been used to study the local and intermediate-range order in photodiffused amorphous Ag-${\mathrm{GeSe}}_{2}$ thin films and a variety of Ag-Ge-Se alloys. Using synchrotron-radiation sources, the GIXS technique can be used in conjunction with radial-distributio…
A new approach to the study of plastic flow in semiconductors is introduced. By analyzing relaxation of misfit strain in metastable strained-layer structures, the effects of resolved shear stress up to several GPa can be examined, at least an order of magnitude larger than is accessible using conventional loading tech…
The linear coefficient of thermal expansion of the fcc metals Cu, Ag, Au, Ni, Pd, and Pt are computed using the semiempirical embedded-atom method to determine the energetics. The results are in good agreement with experiment. The importance of including the equation of state in the determination of the empirical func…
We study the profile of a thin liquid film completely wetting a rough solid surface. The long-wavelength undulations of the liquid interface follow those of the solid surface, while short-wavelength undulations are strongly damped. There is Lorentzian damping of wavelengths smaller than the healing length ξ determined…
Vanadium nitride (NaCl structure, [N]/[V]\ensuremath{\ge}0.99, space group Fm3\ifmmode\bar\else\textasciimacron\fi{}m, a=4.1328(3) A\r{} at 298 K) transforms at 205(5) K into a tetragonal, noncentrosymmetric low-temperature modification [space group P4\ifmmode\bar\else\textasciimacron\fi{}2m, a=4.1314(3) A\r{}, c=4.11…
The elastic constants of an amorphous binary soft sphere alloy have been determined by molecular-dynamics simulations. The shear modulus of the amorphous solid is found to vanish at the glass transition temperature, below which it is significantly smaller than the value found for a polycrystalline sample under the sam…
Raman scattering from one- and two-magnon excitations in various rare-earth orthoferrites are studied. The magnetic in-plane and out-of-plane anisotropy energies of these systems are obtained and discussed based on the two-sublattice model of ironspins. Detailed temperature dependence of the frequencies of two \(k{\co…
Dielectric relaxations in undiluted cis-polyisoprene (cis-PI) with narrow molecular-weight distribution were investigated. The normal mode process due to fluctuation of the end-to-end distance and the segmental mode process due to the local segmental motions were observed. The average relaxation time τn for the normal…
A recent measurement of the force-height relation for two layers of end-grafted polystyrene chains in toluene is shown to be in excellent quantitative agreement with our recent theory, which is an exact solution of self-consistent field equations applicable in the limit of strongly stretched chains. Two undetermined p…