Materials Literature
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The Mossbauer spectrum of dilute 57 Fe 2+ in MgCO 3 shows a well resolved magnetic hyperfine pattern at 4.2K due to a very slow rate of electronic spin relaxation. Above 60K only pure quadrupole splitting is obtained as a result of very fast spin-lattice relaxation rate. The spin-lattice relaxation behaviour of Fe 2+…
The apparent suppression of plasmon satellites in core-level photoemission at low electron kinetic energy is studied. The process of photoemission is studied in the Golden Rule formulation, and the final-state wavefunction corresponding to the photoemitted electron leaving a plasmon excited in the solid is found using…
57 Fe Mossbauer spectroscopy is used to investigate the low-temperature behaviours of alpha -MnS and MnSe, and the results are successfully interpreted in terms of a crystal field model. In alpha -MnS there are at least two magnetic spin arrangements. At 131K<T<T N the spins are along a cubic (110) direction, whereas…
The DC G(T) has been measured in the approximate range 4-320K for crystalline samples of the series Ti n O 2n-1 with 4<or=n<or=9. This includes the first results reported for n=7, 8 and 9. The G(T) for n=4, 5 and 6 show qualitative differences from the behaviours reported previously, including extra transitions at 127…
Measurements of transient magnetic birefringence are reported for isotropic solutions of a biological rodlike macromolecule, bacterial virus fd. A steep increase of the birefringence and a slowing down of the relaxation process are observed just below the concentration at which the liquid-crystalline phase appears. Th…
High-resolution phase diagrams of four binary liquid-crystal mixtures exhibiting nematic, smectic-A, smectic-C multicritical points are found to be universal.Received 23 September 1982DOI:https://doi.org/10.1103/PhysRevLett.50.178©1983 American Physical Society
A resolution to the controversy over the magnitude of the effective short-range Coulomb interaction in molecular conductors is proposed by showing that it depends very strongly on band filling because of intermolecular correlations.
M-C calculations based on the Fröhlich-theory of electron–LO-phonon scattering are used to determine energy losses and attenuation lengths of excited electrons with initial energies E0 < Eg ≈ ≈ 9 eV within the conduction band of SiO2. The attenuation length depending on an electric field F can be described by λa(F) =…
The temperature dependence of the impedance at frequencies between 100 Hz and 5 MHz and of the dc resistance of SrTiO3 and BaTiO3 single crystals are investigated in the temperature range between 300 and 1300 K. An anomalous behaviour of the capacitance can be explained phenom-enologically as due to the combined effec…
The electron mobilities associated with the transverse-optical (TO) mode are discussed in the perovskite oxide ferroelectric semiconductors. In this scattering model the instability of the TO mode is taken into account, so that the spontaneous polarization and the soft mode produce an important effect on the electron…
We show in this paper that, notwithstanding the isotropic nature of Miedema's semi-empirical theory for the heat of formation $\ensuremath{\Delta}H$ of intermetallic phases, and contrary to the present view in literature, the parameters ${\ensuremath{\Phi}}^{*}$ and ${n}_{\mathrm{WS}}$ used to predict the signs of $\e…
The electrical resistivity of three exfoliated graphites (Grafoil, Foam, and Union Carbide UCAR-ZYX) has been measured in the temperature range 1.5-300 K. While the resistivity measured across the rolling plane, ${\ensuremath{\rho}}_{\ensuremath{\perp}}$, is comparable to the $c$-axis resistivity of highly oriented py…
The thermodynamic stability, the dielectric, diamagnetic, and elastic properties of mixtures of polar as well as those of nonpolar nematic liquid crystals were investigated and compared to the properties of their components. Small deviations from the ideal behavior were observed and attributed to differences in the pa…
Procedures are presented for the accurate calculation of the total energy of a solid within the framework of the local-density approximation. The starting point is a self-consistent band calculation using a basis of localized orbitals. The method is applied to study the total energy of metallic lithium as a function o…
Recent Brillouin scattering studies of relaxation in the simple ion system Ca++–K+/NO−3 (two particles of argon structure and a small anion) provide the experimental basis for a direct comparison of glass transformation phenomenology in computer simulated LJ argon ‘‘glass,’’ with that in laboratory substances studied…
The stage and temperature dependences of the in-plane thermal conductivity of graphite-Fe${\mathrm{Cl}}_{3}$ acceptor intercalation compounds are reported and analyzed, as well as the temperature dependence of a stage-5 potassium donor compound. The measured thermal conductivity is tentatively separated into an electr…
We have measured the enhanced Raman scattering by a liquid (methyl alcohol) in contact with an evaporated film of silver (\ensuremath{\sim}400 \AA{}) deposited on the flat surface of a hemispherical prism. The exciting laser light (5145 \AA{}) was incident on the film through the prism and the scattered light from the…
Experimental measurements and theoretical calculations are reported which may resolve some of the remaining difficulties associated with photoemission from anion vacancies in thermochemically reduced MgO crystals. The intensities of the 2.3- and 3.2-eV luminescence bands are found to be strongly influenced by both the…
Vanadium dioxide (VO2) film which has nearly the same transition point as single crystal has been obtained by reactive evaporation of vanadium on glass and subsequent annealing in N2 gas. Relations between optical properties of V02 film and its preparation conditions are presented. We made optical direct bit recording…
Carbon dioxide formation from coadsorbed atomic oxygen and molecular carbon monoxide has been characterized using temperature programmed reaction spectroscopy over a wide range of initial oxygen and carbon monoxide coverages. The experiments were performed in an apparatus containing Auger electron spectroscopy, low en…