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Yatsenko A.V.,Crimean Federal University Named After rnadsky | Palatnikov M.N.,RAS Institute of Chemistry | Sidorov N.V.,RAS Institute of Chemistry | Pritulenko A.S.,Crimean Federal University Named After rnadsky | Evdokimov S.V.,Crimean Federal University Named After rnadsky
Physics of the Solid State | Year: 2015

The electrical conductivity of single crystals of lithium tantalate and lithium niobate of the congruent composition not subjected to special thermochemical treatments has been investigated in the temperature range of 290–450 K. It has been shown that the charge transfer mechanisms and carrier types in these crystals are identical in the temperature range under study. The presence of mobility anisotropy of conduction electrons has been revealed and its influence on the recording and storage of optical phase holograms in these crystals has been established. © 2015, Pleiades Publishing, Ltd.


Strugatsky M.B.,Crimean Federal University Named After rnadsky | Skibinsky K.M.,Crimean Federal University Named After rnadsky
Physics of the Solid State | Year: 2015

The contribution caused by hydrostatic pressure to the basal magnetic anisotropy of a rhombohedral easy-plane weak ferromagnet has been calculated based on the thermodynamic potential including new magnetoelastic invariants. It has been shown that, taking into account the magnetoelastic terms of a higher order with respect to the magnetic variables, it is possible to simulate the observed substantial increase in the effective hexagonal anisotropy constant in a strained hematite crystal by the action of a relatively weak hydrostatic pressure. This approach enables one to obtain additional terms proportional to the pressure in the cubic and hexagonal anisotropies. The contribution of new terms into the effective hexagonal anisotropy is substantially greater than the contribution from the previously considered addition to the uniaxial anisotropy constant. Estimates of higher-order magnetoelastic constants for hematite are presented. © 2015, Pleiades Publishing, Ltd.


Neklyudov E.A.,Crimean Federal University Named After rnadsky | Klevets P.N.,Crimean Federal University Named After rnadsky | Fridman Y.A.,Crimean Federal University Named After rnadsky
Physics of the Solid State | Year: 2016

The investigations performed in this work have demonstrated that an easy-axis frustrated non-Heisenberg magnet can contain homogeneous phases with the vector (ferromagnetic) and tensor (nematic) orderings, as well as a spatially inhomogeneous phase of the magnetic spiral type. Depending on the relationships between the material parameters, either a ferromagnetic spiral or a spiral of the quadrupole–ferromagnetic type with different periods of the spiral structures can be formed in the system. The phase diagram of the system has been constructed. © 2016, Pleiades Publishing, Ltd.

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