Materials Literature
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For monocrystalline V1-xMexO2-y samples (Me = Ga, Al, Fe) the effect of nonstoichiometry (oxygen deficiency) on the electrical, magnetic, and structural properties of Me3±-doped vanadium dioxide is investigated. The influence of acceptor-like defects caused by the Me3± doping is compensated by donor-like defects cause…
A method of analysis of curves for diffraction reflection from crystals with a disturbed surface layer is developed. It allows to determine, directly from experimental data, the integral characteristics of the disturbed layer, such as the thickness of the disturbed layer, Leff, mean change in the interplanar spacings…
In-situ-deformation experiments are made in a high voltage electron microscope. In MgO single crystals the processes governing the dislocation mobility are the overcoming of local obstacles at the screw dislocations and the Peierls mechanism at edge dislocations. The dislocations multiply mainly from edge dislocation…
The phase transition in KH 3 (SeO 3 ) 2 was studied by thermal measurements of specific heat and lattice parameters. The transition entropy estimated experimentally agrees satisfactrily with that calculated by a phenomenological theory in which a latent transition parameter was introduced. Other thermal results are al…
A comparison is made of two versions of the acoustic-mismatch theory of the thermal boundary resistance $R$ which occurs at the interface between a pair of solids. The most recent version predicts $R\ensuremath{\rightarrow}0$ as the two solids become identical, while the earlier version indicates a finite $R$ as the i…
The self-diffusion coefficient D of silver ions in α-Ag 2 Te has been measured by the tracer technique using Ag 110m and the mobility µ of cations is estimated from the ionic conductivity σ. The ratio µ/ D is slightly deviated from the Einstein relation. This deviation is discussed in comparison with a theory appropri…
The McLachlan susceptibility theory is used to calculate the van der Waals–Lifshitz forces betwen two chiral, rodlike dielectric particles embedded in an isotropic dielectric medium. The resulting interparticle potential contains an asymmetric term in φ, the mutual dihedral angle between the major axes of the particle…
The results of an experimental study of nonlinear electrical transport at low temperatures are described for the one-dimensional organic conductors TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane) and TSeF-TCNQ (tetraselenafulvalene-tetracyanoquinodimethane). The $b$-axis conductivity is nonlinear in both compou…
A new spectroscopic technique for imaging the spatial distribution of nonradiative defects in semiconductor materials is presented. The technique combines the versatility and sensitivity of deep-level transient spectroscopy (DLTS) with the capability for defect analysis at high resolution of the scanning transmission…
The static magnetic susceptibility of single crystal MnTe 2 from 4.2 K up to 450 K was measured. The exchange constants J 1 and J 2 are estimated as -7.1 K and +1.3 K, respectively, using the high-temperature power series method. This set of J 1 and J 2 are consistent with the stability region for the 1-st kind AF ord…
We present a systematic Hamiltonian formulation and quantization of the massless spin-3/2 field theory using the Hamiltonian methods of Dirac and Faddeev.Received 25 February 1977DOI:https://doi.org/10.1103/PhysRevD.16.307©1977 American Physical Society
Ferroelastic behaviors have been found in Ca 2 Sr(C 2 H 5 CO 2 ) 6 . The tetragonal c axis of the crystal is rotated by angle 90° under appropriate external stress in the paraelectric phase. This axis rotation is always accompanied with the conversion of the sense of optical power. It is shown that these facts can be…
The band structure and the density of states of Zr${\mathrm{B}}_{2}$ have been calculated by an augmented-plane-wave method and compared with the observed x-ray photoelectron spectrum of valence band. The theoretical energy-distribution curve obtained by using the Kohn-Sham exchange potential was in good agreement wit…
Angular-resolved photoelectron spectra (ARPES) are presented for GeS using 21-eV excitation energy. From the measurements that cover a wide range of angles along the two principal directions in the basal plane of the orthorhombic layered compound GeS $E$ vs ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}}_{\ensurema…
A simple relationship similar to that reported by Mollwo and Ivey relating peak absorption energy to the lattice parameter in the alkali halides has been noted for several oxides of group-II and -III metals, including BeO, ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, Mg${\mathrm{Al}}_{2}$${\mathrm{O}}_{4}$, ${\mathrm{Y}}_{3…
Core-electron, valence-, and conduction-band spectra of the cubic sodium-tungsten bronzes ${\mathrm{Na}}_{x}\mathrm{W}{\mathrm{O}}_{3}$ have been obtained by x-ray photoelectron spectroscopy. The samples were vacuum-cleaved single crystals spanning the entire cubic composition range. The band spectra are consistent wi…
A microscopic model of charge-density waves in $2H\ensuremath{-}\mathrm{Ta}{\mathrm{Se}}_{2}$ at zero temperature is developed and applied to calculate the lattice dynamics in the commensurate phase. The results are compared with the Raman data of Holy et al. At finite temperatures the conventional microscopic approac…
X-ray photoelectron spectra (XPS) and $\mathrm{Al} K$ and $\mathrm{Al} {L}_{2,3}$ soft-x-ray spectra (SXS) of valence bands for aluminum-noble-metal alloys are rationalized on the basis that SXS spectra are dominated by dipole selection rules while XPS spectra chiefly reflect the noble-metal $d$ bands. We find, in agr…
We have used the triple-axis neutron-scattering technique to study $2H\ensuremath{-}\mathrm{Ta}{\mathrm{Se}}_{2}$ and $2H\ensuremath{-}\mathrm{Nb}{\mathrm{Se}}_{2}$ which undergo charge-density wave transitions at ${T}_{0}=122.3$ K and ${T}_{0}=33.5$ K, respectively. The transitions in both compounds appear to be seco…
We have investigated the influence of donor and acceptor substituents on the second and third order hyperpolarizabilities β and γ of large conjugated molecules such as stilbene and styrene derivatives. This was performed by two independent measurements of β and γ using the techniques of dc electric-field induced secon…