Nature of the low-temperature anomalies in the physical properties of the intermediate-valent compound SmB6

The transport properties (Hall coefficient, thermopower, and resistivity) of high-quality single-crystal samples of the classical mixed-valent compound SmB₆ are investigated over a broad temperature range (1.6–300 K) in magnetic fields up to 45 T for the first time following the quasioptical measurements in the 0.6–4.5 meV frequency range [B. Gorshunov, N. Sluchanko, A. Volkov et al., submitted to Phys. Rev. B (1998)]. Measurements in the intrinsic conduction region permit determination of the gap width E _g ≈20 meV and evaluation of the behavior of the mobility and concentration of light and heavy charge carriers, as well as the temperature dependence of the carrier relaxation time, in samarium hexaboride. The results of experimental investigations in the “impurity” conduction region (E _ex≈3.5 meV) are discussed within the Kikoin-Mishchenko exciton-polaron model of charge fluctuations. Arguments supporting the formation of a metallic state with an electron-hole liquid in SmB₆ at liquid-helium temperatures are presented. Zh. éksp. Teor. Fiz. 115, 970–978 (March 1999)     

Anomalous Hall Effect in Frustrated Magnets

Physics of the Solid State - Comparative analysis of Hall effect in substitutional solid solutions Ho0.5Lu0.5B12, Mn1 – xFexSi (0 ≤ x ≤ 1) and...     

Consideration of the spin-orbit interaction in the description of nucleon transfers upon heavy ionic nuclei collisions

A difference scheme is proposed for the numerical solution of a time-dependent Schr?dinger equation with spin-orbit interaction. Evolution of an external neutron wave function with the minimum full moment projection onto the internuclear axis and the probability of neutron transfer upon frontal collisions of ⁴⁰Ca and ⁹⁶Zr nuclei are calculated.     

Dynamic tunnel effect at low-energy nuclear reactions with neutron-rich nuclei

The probability of neutron transfer between nuclei at close low-energy collisions has been investigated as a function of the energy of the neutron separation, the energy in a center-of-mass system E and the collision impact parameter. The energy dependence of the neutron transfer cross section in the ⁶He + ¹⁹⁷Au reaction has been explained.     

Magnetoresistance and magnetization anomalies in CeB6

High precision magnetoresistance (MR) Δρ/ρ(H,T) and magnetization M(H,T) measurements have been carried out for well known and typical strongly correlated electron system—cerium hexaboride. The detailed measurements have been fulfilled on single crystalline samples of CeB₆ over a wide temperature range in magnetic fields up to 70 kOe. It was shown that the MR anomalies in the magnetic heavy fermion compound under investigation can be consistently interpreted in the frameworks of a simple relation between resistivity and magnetization—Δρ/ρ∼M² obtained by Yosida [Phys. Rev. 107(1957)396]. A local magnetic susceptibility χ_loc(T,H)=(1/H^*(d(Δρ/ρ)/dH))^1/2 was deduced directly from the MR Δρ(H,T) measurements and compared with the experimental data of magnetization M(H,T). The magnetic susceptibility dependences χ_loc(T,H) and χ(T,H) obtained in this study for CeB₆ allow us to analyze the complicated H-T magnetic phase diagram of this so-called dense Kondo-system.     

Emission of high-energy alpha particles in nuclear reactions of 48Ca and 56Fe ions on 181Ta and 238U targets

The results of experiments on measuring the energy spectra of alpha particles in reactions with heavy ions are presented. The measurements were performed using the high-resolution magnetic analyzer MAVR with beams of ⁴⁸Ca (280 MeV) and ⁵⁶Fe (320 and 400 MeV) on ¹⁸¹Ta and ²³⁸U targets at an angle of 0°. A strong dependence of the double differential cross sections for production of alpha particles on the atomic number of the target nucleus was observed, which indicates that fast alpha particles are mainly emitted from the target nucleus; this conclusion was also confirmed by calculations within the time-dependent Schr?dinger equation approach. An analysis of the obtained experimental data was carried out within the model of moving sources modified to consider the kinematic limits for two-body and three-body exit channels.     

Volume increasing isometric deformations of polyhedra

We prove that any bounded polyhedron in 3 dimensional space can be isometrically deformed so as to enclose greater volume.     

Molecular weight properties of poly(butyl acrylate): Computational experiment based on a kinetic model of “living” radical polymerization with reversible addition-fragmentation chain transfer

Based on a kinetic model of “living” radical polymerization of butyl acrylate with reversible chain-transfer, the characteristics of altering the molecular weight properties of the polymer by varying the initial concentrations of the reactants and temperature are established.     

Cyclotron resonance and the de Haas-van Alfven effect in the (BEDT-TTF)8Hg4Cl12(C6H5Cl)2 organic conductor

This paper reports on measurements of the de Haas-van Alfven effect in the quasi-two-dimensional organic conductor (BEDT-TTF)₈Hg₄Cl₁₂(C₆H₅Cl)₂ performed within the temperature range 0.33–1.44 K in magnetic fields of B≤50 T. An analysis of quantum oscillations together with cyclotron resonance data obtained in the 40–120-GHz frequency range revealed that the complex quantum-oscillation spectrum is formed by the fundamental frequencies α～256 T and β～670–610 T, as well as by combination and multiple frequencies. It is shown that the character of the temperature-induced oscillation-spectrum rearrangement can be interpreted within a model taking into account the existence of a magnetic phase transition at T _c～0.9 K and the closeness of the fundamental frequency α with effective mass m*=1.48m ₀ to the spin damping condition.     

Vector nonlinear interactions of light waves in LiIO3 and K2S2O6 crystals

The influence of the physical properties of crystals on the noncollinear interaction of light waves in nonlinear media is examined in an example of LiIO₃ and K₂S₂O₆. Peculiarities in the vector interaction are noted in crystals with quadratic and cubic nonlinearities. Experimental results are presented.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 65–70, August, 1974.