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  1. Article

    Open Access

    Magnetic Structure and the Spin-Crossover Mechanism in Ludwigite Со3BO5

    A spin-crossover mechanism in ludwigite Со3BO5 is proposed on the basis of the DFT calculation with SCAN potentials. The role of separate exchange interactions in the establishment of the long-range magnetic orde...

    N. G. Zamkova, V. S. Zhandun, S. G. Ovchinnikov in JETP Letters (2023)

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  2. No Access

    Article

    Proximity of Ferromagnetic Nickel to Paramagnetic Instability

    The phase diagram of Ni in the space of the parameters has been studied within the Kanamori model with the parameters determined from comparison with ab initio calculations for ferromagnetic Ni. The proximity ...

    N. G. Zamkova, V. A. Gavrichkov, I. S. Sandalov, S. G. Ovchinnikov in JETP Letters (2019)

  3. No Access

    Article

    Iron silicide-based ferromagnetic metal/semiconductor nanostructures

    Ferromagnetic single-crystal epitaxial Fe3Si films and polycrystalline Fe5Si3 films are obtained on Si substrates by molecular-beam epitaxy with in situ control of the structure, optical, and magnetic properties....

    S. G. Ovchinnikov, S. N. Varnakov, S. A. Lyashchenko… in Physics of the Solid State (2016)

  4. No Access

    Article

    Effect of an Eu3+ impurity on the antiferrodistortion and ferroelectric instabilities in an EuTiO3 bulk crystal and thin films

    The existence of an antiferrodistortion transition in EuTiO3 is disputable, and this question needs to be answered. One of the possible causes is the presence of an Eu3+ impurity in a sample. A nonempirical polar...

    V. S. Zhandun, N. G. Zamkova, V. I. Zinenko in Journal of Experimental and Theoretical Ph… (2015)

  5. No Access

    Article

    Ferroelectric and structural instability in double perovskites Me1+Bi3+Me3+Nb5+O6 (Me1+ = Na, K, Rb; Me3+ = Sc, Ga, In, Lu)

    Within the Gordon-Kim generalized model with regard to the polarizabilities of ions, the lattice constants, the high-frequency permittivity, the Born dynamic charges, and the vibration constants of the crystal...

    V. I. Zinenko, N. G. Zamkova, V. S. Zhandun… in Journal of Experimental and Theoretical Ph… (2012)

  6. No Access

    Article

    Effect of Sr2+ ion substitution with trivalent ions (Sc3+, In3+, La3+, Bi3+) on its ferroelectric instability in SrTiO3

    The vibration frequencies of unstable ferroelectric and antiferrodistortion modes and the dependences of the energy on the ion displacement amplitude have been calculated within the generalized Gordon-Kim mode...

    N. G. Zamkova, V. S. Zhandun, V. I. Zinenko in Physics of the Solid State (2011)

  7. No Access

    Article

    Lattice dynamics and the ferroelectric phase transition in ordered Pb2 B′B″O6 (B′ = Ga, In, Lu; B″ = Nb, Ta) solid solutions

    The lattice vibration spectrum, rf permittivity, and dynamic Born charges have been calculated for ordered Pb2 B′B″O3 (B′=Ga, In, Lu; B″=Nb, Ta) solid solutions in terms of the generalized...

    V. S. Zhandun, N. G. Zamkova, V. I. Zinenko in Physics of the Solid State (2010)

  8. No Access

    Article

    Effect of cation substitution on the lattice dynamics and ferroelectric instability of cubic BaTiO3 and BaZrO3 doped with Bi and La ions

    The spectra of lattice vibration frequencies of solid solutions Ba1 − x Bi2x/3▭ x/3Ti(Zr)O3 and Ba1 − x La x ...

    N. G. Zamkova, V. I. Zinenko in Physics of the Solid State (2009)

  9. No Access

    Article

    Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB′1/2B″1/2O3 (B′ = Ga, In, Lu; B″ = Nb, Ta) solid solutions

    The lattice vibration spectra, rf permittivity, and dynamic Born charges of disordered PbB′1/2B″1/2O3 (B′ = Ga, In, Lu; B″ = Nb, Ta) solid solutions are calculated in terms of the generalized Gordon-Kim model. Al...

    V. S. Zhandun, N. G. Zamkova, V. I. Zinenko in Journal of Experimental and Theoretical Ph… (2008)

  10. No Access

    Article

    Ab initio calculation of the ferroelectric phase transition in disordered and ordered PbSc0.5Ta0.5O3 and PbSc0.5Nd0.5O3 solid solutions with the use of a model Hamiltonian

    To describe the ferroelectric phase transition in ordered and disordered PbSc0.5Ta0.5O3 (PST) and PbSc0.5Nd0.5O3 (PSN) solid solutions, a model Hamiltonian is written in the local-mode approximation, in which lon...

    V. I. Zinenko, N. G. Zamkova in Journal of Experimental and Theoretical Physics (2008)

  11. No Access

    Article

    Lattice dynamics and ferroelectric instability in ordered and disordered PbSc1/2Ta1/2O3 and PbSc1/2Nb1/2O3 solid solutions

    The dynamic Born charges and the frequency spectra of lattice oscillations in the crystals of ordered and disordered PbSc1/2Ta1/2O3 (PST) and PbSc1/2Nb1/2O3 (PSN) solid solutions have been calculated within the f...

    V. I. Zinenko, N. G. Zamkova, E. G. Maksimov… in Journal of Experimental and Theoretical Ph… (2007)

  12. No Access

    Article

    Study of ferroelectric phase transitions in disordered PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3 solid solutions

    Ferroelectric phase transitions and thermodynamic properties of disordered PbSc1/2Ta1/2O3 and PbSc1/2Nb1/2O3 solid solutions have been investigated by the Monte Carlo method. The parameters of the effective Hamil...

    N. G. Zamkova, S. N. Sofronova… in Bulletin of the Russian Academy of Science… (2007)

  13. No Access

    Article

    Vibrational spectrum and elastic properties of KPb2Cl5 crystals

    The Raman spectra and elastic moduli of KPb2Cl5 crystals were studied experimentally. The results are interpreted using a parameter-free model of the crystal lattice dynamics with inclusion of the multipole momen...

    K. S. Aleksandrov, A. N. Vtyurin, A. P. Eliseev… in Physics of the Solid State (2005)

  14. No Access

    Article

    Lattice dynamics and Raman scattering spectrum of elpasolite Rb2KScF6: Comparative analysis

    Raman scattering spectra of elpasolite Rb2KScF6 are studied in a wide temperature range including two phase transitions: from the cubic to the tetragonal phase and then to the monoclinic phase. The experimental R...

    S. N. Krylova, A. N. Vtyurin, A. Bulou, A. S. Krylov… in Physics of the Solid State (2004)

  15. No Access

    Article

    Hydrostatic pressure-induced phase transitions in RbMnCl3: Raman spectra and lattice dynamics

    Raman scattering spectra of RbMnCl3 are measured at room temperature under high hydrostatic pressure. The results are interpreted based on first principles lattice dynamics calculations. The experimental data obt...

    A. N. Vtyurin, S. V. Goryainov, N. G. Zamkova, V. I. Zinenko… in Physics of the Solid State (2004)

  16. No Access

    Article

    Microscopic calculations of displacive (Elpasolite family) and order-disorder (Potassium selenate family) structural phase transitions

    The critical temperatures and thermodynamic characteristics for the displacive phase transition O h 7 → O 4h 5 ...

    V. I. Zinenko, N. G. Zamkova in Crystallography Reports (2004)

  17. No Access

    Article

    The structural properties of RbMnX3 (X = F, Cl, Br) halides

    The results of nonempirical calculation of energies of three polytypes (cubic, two-layer hexagonal, and six-layer hexagonal) are given for RbMnX3 (X = F, Cl, Br) crystals. The calculation is performed using an io...

    V. I. Zinenko, N. G. Zamkova… in Journal of Experimental and Theoretical Ph… (2003)

  18. No Access

    Article

    Lattice dynamics and hydrostatic-pressure-induced phase transitions in ScF3

    New phase transitions induced by hydrostatic pressure in a cubic (under standard conditions) ScF3 crystal are discovered by the methods of polarization microscopy and Raman scattering. The space groups ...

    K. S. Aleksandrov, V. N. Voronov… in Journal of Experimental and Theoretical Ph… (2002)

  19. No Access

    Article

    Lattice dynamics and statistical mechanics of the Fm3m → I4/m structural phase transition in Rb2KInF6

    The static and dynamic properties of cubic Rb2KInF6 crystals with elpasolite structure are calculated using a nonempirical method. Calculations are performed within a microscopic ionic-crystal model taking into a...

    V. I. Zinenko, N. G. Zamkova in Physics of the Solid State (2001)

  20. No Access

    Article

    Theory of an Fm3m→I4/m structural phase transition in an Rb2KScF6 crystal

    An Rb2KScF6 crystal having an elpasolite structure undergoes a sequence of Fm3m→I4/m→P121/n1 structural phase transitions where the transition to the tetragonal phase is associated with “rotation” of the ScF6 oct...

    V. I. Zinenko, N. G. Zamkova in Journal of Experimental and Theoretical Physics (2000)

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