Effects of a constant electric field in the polariton spectrum of a 1D magnetic photonic crystal with antiferromagnetic interlayer exchange

The effect of a constant external electric field was analyzed and the contribution of the volume fractions of magnetic and nonmagnetic phases to the polariton dynamics of a one-dimensional easy-axial fer-romagnet-nonmagnetic dielectric photonic crystal with a magnetic compensation point was determined using the effective medium method.     

Quasi-ordered nanostructures on the surface of strontium titanate

The results of the investigation of the surface of strontium titanate single crystals after treatment with high-energy plasma are presented. The surface morphology of the strontium titanate single crystals and the change in its characteristics after plasma treatment have been studied using electron scanning and atomicforce microscopy. A change in the electronic state of a part of the titanium ions and a change in the stoichiometry in the modified near-surface layer have been found by the method of valence shift of X-ray lines. A preliminary analysis has been made of the conditions providing the formation of single- and two-level systems of ordered crystallites with sizes of 10⁻⁷–10⁻¹⁰ m on the surface of single-crystal strontium titanate with impurities of ions of the iron and lanthanum groups.     

Nature of stabilization of water-coal fuel suspensions

Effect of chemical additives (plasticizers) on viscous properties of water-coal suspensions mostly based on brown coals was studied.     

The influence of magnetic ordering on the electronic energy structure of CuFeS<Subscript>2</Subscript>

The modified LAPW+lo method with Wien2k software package was used to calculate the electronic energy structure of CuFeS₂ as a component of chalcopyrite. CuFeS₂ was found to be a conductor in the absence of antiferromagnetic ordering. Antiferromagnetic ordering in (001) layers leads to appearance of an energy gap and transforms CuFeS₂ into a semiconductor. In the GGA+U approximation, E g ≈ 0.75 eV was achieved for U = 6 eV, which is close to experimental value.     

Picosecond three-color holographic digital interferometry

The possibilities of multicolor digital holographic interferometry are experimentally studied upon measuring displacements of a surface in radiation of a picosecond Nd:YAG laser with the radiation frequency conversion into harmonics (λ₁ = 1.06 μm, λ₂ = 0.53 μm, and λ₃ = 0.35 μm). It is shown that three-color digital holographic interferometry makes it possible to increase the measurement accuracy of displacements. The peculiarities of multicolor digital holographic interferometry by picosecond pulses are discussed.     

Results of Russian/US high-performance DEMG experiment

In November 1992, the All-Russian Scientific Research Institute of Experimental Physics (VNIIEF), Arzamas-16, Russia and the Los Alamos National Laboratory, Los Alamos NM, USA embarked on a historic effort to conduct a joint explosive pulse-power experiment. With the concurrence of the Ministry of Atomic Energy (Russia) and the Department of Energy (US), the two laboratories entered into a laboratory-to-laboratory collaboration in the areas of very high-energy pulse power and ultrahigh magnetic fields in order to explore problems of mutual scientific interest. The first experiment to be planned was an explosively powered, fast, high-current pulse-power system demonstration. The experiment used a flux compressor, inductive store, and high-current opening switch to demonstrate the feasibility of supplying many megajoules of electrical energy, on microsecond time scales, to high-energy density physics experiments. The experiment was conducted in Arzamas-16 on September 22, 1993     

Temperature dependence of the dielectric parameters of nonstoichiometric SrTiO3 single crystals

The results of experimental studies of the temperature dependence of the low-frequency permittivity ε ₀ and the loss tangent taδ of nominally undoped and doped single crystals of strontium titanate at T = 10–300 K are given. The samples were doped with ions of iron-group metals (V, Mn, Fe, Co) and/or ions of rare earth metals (Pr, Nd, Sm, Tm) with concentrations of 10^?3?5 × 10^?1 at %. Anomalous temperature dependences ε₀ T and tanδ(T) were found for a number of samples. The anomalies found were attributed to the violation of stoichiometry of the single crystals under study and the transition of some fraction of Ti⁴⁺ ions to the Ti³⁺ state.     

Nuclear effects in the F3 structure function for finite and asymptotic Q

We study nuclear effects in the structure function F₃ which describes the parity violating part of the charged-current neuitrino nucleon deep inelastic scattering. Starting from a covariant approach we derive a factorized expression for the nuclear structure function in terms of the nuclear spectral function and off-shell nucleon structure functions valid for arbitrary momentum transfer Q and in the limit of weak nuclear binding, i.e. when a nucleus can be treated as a non-relativistic system. We develop a systematic expansion of nuclear structure functions in terms of a Q⁻² series caused by nuclear effects (“nuclear twist” series). Basing ourselves on this expansion we calculate nuclear corrections to the Gross-Llewellyn-Smith sum rule as well as to higher moments of F₃. We show that corrections to the GLS sum rule due to nuclear effects cancel out in the Bjorken limit and calculate the corresponding Q⁻² correction. Special attention is paid to the discussion of the off-shell effects in the structure functions. A sizable impact of these effects both on the Q² and x dependence of nuclear structure functions is found.