Effect of the spin short-range order on electron transport and neutron scattering in amorphous alloys Gd<Subscript>x</Subscript>Si<Subscript>1−<Emphasis Type="Italic">x</Emphasis></Subscript>

Direct experimental evidence has been obtained for the existence of short-range ferromagnetic order in Gd_xSi_1?x alloys. Along with the standard magnetotransport measurements, a “local” experimental method of the elastic scattering of thermal neutrons on the magnetic moment of Gd is applied. The measurement results provide the conclusion that short-range ferromagnetic order is formed in nanoclusters with an increased content of Gd ions. We consider the amorphous alloy Gd_xSi_1?x as a new magnetic material with unique properties characteristic of both strongly inhomogeneous alloys and nanocomposite compounds.     

Features of the calibration of vector acoustic units in the inhomogenous field of a vertically oscillating liquid column

The features of the calibration of finite-sized vector acoustic units in the field of a plane standing wave and the possibility of taking the frequency-dependent errors that occur at the same time into account, which allows extension of the frequency range of existing facilities in the region of higher frequencies without the loss of precision of horn calibration, are discussed.     

Modification of polymeric composites with electric and magnetic fields

Effect of the component composition and magnetic and electric fields on the structure and dielectric and electromechanical properties of composites constituted by incompatible polymers, cellulose acetobutyrate and segmented polyurethane, was studied.     

Analyzing Power in the Reaction p + p └ → π 0 + X in the polarized-target fragmentation region at an energy of 50 GeV

The results obtained by measuring, at the U-70 accelerator in Protvino, the single-spin asymmetry A _N in the reaction p + p _└ → π⁰ + X at a beam energy of 50 GeV in the Feynman variable range of ?0.6 < x _F < ?0.1 are presented. The asymmetry A _N is close to zero at small |x _F | and grows in magnitude with |x _F |, reaching 6.4% in the region of |x _F | > 0.25. The results of these measurements agree with data of the E704 experiment on the asymmetry of π ₀ mesons at the Fermi National Accelerator Laboratory in the region of polarized-beam fragmentation and with the results of measurements in the region of polarized-target fragmentation that were performed in Protvino by using a 40-GeV π ^?-meson beam and a 70-GeV proton beam.     

Magnetic and structural instabilities in the hexagonal Laves hydride ErMn2H4.6 under high-pressure

The structural and magnetic properties of ErMn₂H_4.6 have been studied by X-ray and neutron diffraction up to the pressures of 15 and 6 GPa, respectively. In the pressure range 0<P<3 GPa we observe a first-order phase transition to new high-pressure (HP) phase. The HP phase has the same hexagonal unit cell as the ambient-pressure phase but smaller lattice parameters (ΔV/V=−5%). The structural transition results in suppression of the long-range antiferromagnetic order. Our results suggest that pressure changes positions of the hydrogen atoms in the metal host. We speculate that the new arrangement of hydrogen atoms induces spin frustration and, therefore, suppresses long-range magnetic order in the HP phase.