Materials Literature
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Coupled surface plasmons in a thin free-standing metal film with both the interfaces periodically corrugated are studied. Infinite Rayleigh expansions in terms of the spatial harmonics with proper boundary conditions are used to obtain the infinite hierarchy of coupled amplitude equations. The truncated system of equa…
The alternating copolymer of vinylidenecyanide and vinyl acetate is the first amorphous polymer to show a combination of excellent properties among the several known piezoelectric polymers, e.g., high piezoelectric activity (d31=7 pC/N), high electromechanical constant (kt=0.38), and high thermal stability (glass tran…
The conduction-band structures of CdTe(110), CdS(112\ifmmode\bar\else\textasciimacron\fi{}0), and CdSe(112\ifmmode\bar\else\textasciimacron\fi{}0) have been studied using angle-resolved inverse photoelectron spectroscopy. With normally incident electrons substantial parts of the conduction bands have been observed and…
Crystallization and glass formation processes are studied for the sodium system with 108 atoms by means of molecular dynamics simulation with constant volume. The equilibrium liquids, with four different initial conditions, are cooled with four different rates. The processes are analyzed by means of Voronoi polyhedra,…
We discovered superconductivity at ambient pressure in (DMET) 2 I 3 at 0.47 K and in (DMET) 2 IBr 2 at 0.59 K (midpoints), where DMET is (dimethyl(ethylenedithio)diselenadithiafulvalene), while in (DMET) 2 I 2 Br, superconductivity was not observed down to 0.5 K. In the DMET salts, those with smaller molar volume exhi…
The elastic strain and stress fields and the elastic energy of the system composed of a crystalline epitaxial layer of finite thickness coherently grown on a bulk substrate are calculated, when the intrinsic stress-free lattice parameter of the layer is modulated along directions parallel to the substrate surface. Whe…
The electron density distribution in AgBr was investigated on the basis of X-ray intensity data collected by single crystal diffractometry. It was verified from difference Fourier map that the charge tends to accumulate in the intermediate region between the neighbouring unlike atoms. The origin of the extra charge on…
The crystal structure of [N (CH 3 ) 4 ] 2 ZnCl 4 was studied at three temperatures, 30, 60and 90°C, in the paraelectric phase and at 5.5°C in the ferroelectric phase by using theX-ray reflection data collected by an automatic four-circle diffractometer. The split-atom method and the significance test showed that the c…
Two phenomena are pointed out which, if observed, would testify that the superconductivity in the Bechgaard salts belongs to the triplet pairing: excitation of the spin waves in the radio-frequency fields and the superconductivity restoration in high enough magnetic fields H || b *.
Interpretations for the energies corresponding to the peaks in the reflectivity and the imaginary part (${\ensuremath{\epsilon}}_{2}$) of the complex dielectric constant (\ensuremath{\epsilon}=${\ensuremath{\epsilon}}_{1}$+i${\ensuremath{\epsilon}}_{2}$) have been sought successfully using Penn-like model calculations…
The electronic structure of ${\mathrm{Fe}}_{\mathrm{x}}$O (x\ensuremath{\simeq}0.95) has been studied by photoemission spectroscopy using synchrotron radiation. Fe 3d character in the valence band is found to extend over a wide energy range from the top of the valence band to the satellite region, \ensuremath{\sim}15…
Properties of the electrical resistance of a one-dimensional quasicrystal, whose structure is governed by the Fibonacci rule, are studied by means of the Landauer formula. In particular, it is shown that the growth of the resistance with sample length is bounded by a power law for certain energies. More specifically,…
The reconstructions observed on the annealed (111) surfaces of Si and Ge can be explained on the basis of a simple model of the surface energetics. The driving force for the Si 7\ifmmode\times\else\texttimes\fi{}7 reconstruction is the formation of dimer-row domain walls, which order in a triangular pattern for topolo…
The dynamical structure factor S(Q,\ensuremath{\omega}) and the vibrational density of states g(\ensuremath{\omega}) for amorphous silicon have been measured by neutron scattering methods. Computer simulations of S(Q,\ensuremath{\omega}), based on a 216-atom structural model, are in substantial agreement with experime…
We propose that all ${A}_{1\mathrm{\ensuremath{-}}x}$${B}_{x}$ glasses [where A (B) is a late (early) transition metal] are structurally isomorphic, chemically random alloys which store hydrogen in tetrahedral interstitial sites ${A}_{4\mathrm{\ensuremath{-}}n}$${B}_{n}$ (in decreasing order n=4,3,2,. . . ). The maxim…
We report on thermoelectric power measurements of ${\mathrm{TiS}}_{2}$ taken as a function of temperature. These were done on single crystals between 10 and 300 K and confirm previous conclusions, namely the dominance of ionized-impurity scattering at low temperature and acoustic-phonon scattering at higher temperatur…
Polymer-dispersed liquid crystal (PDLC) films are potentially useful in applications requiring electrically controllable light transmission. In these applications, both a high on-state transmittance and a strong off-state attenuation are often needed over a wide operating temperature range. These transmittance charact…
The problem of an electric field applied to an isotropic dielectric containing a crack is considered as far as induced distortions and mechanical stresses are concerned. Near-tip distortions occur when the crack contains a conducting fluid or the surfaces are lined by a conducting layer. Previous treatments of the pro…
We have studied phonon scattering by films of metals, nonmetals, and condensed gases, 2 A\r{} to ${10}^{4}$ A\r{} thick, deposited onto polished faces of Si crystals, through measurements of the thermal conductivity of these crystals in the boundary scattering regime, between 0.05 and 2.0 K. No evidence has been found…
Expressions are derived for the effective phonon deformation potentials of polycrystalline materials, based on the properties of tensor invariants and the Voigt–Reuss–Hill averages [Proc. Phys. Soc. London Sect. A 65, 349 (1952)]. These results, and similar ones for the elastic constants, are used to determine the eff…