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  1. No Access

    Article

    Breaking of the Cubic Symmetry in Millimeter-Size SrTiO3 Crystals: ESR Manifestations

    The found effect of lowering the symmetry of the crystal structure of thin (less than 1 mm) plates and bars of strontium titanate (SrTiO3) single crystals is discussed. This symmetry lowering manifests itself in ...

    B. F. Gabbasov, I. N. Gracheva, S. I. Nikitin, V. A. Trepakov… in Crystallography Reports (2023)

  2. Article

    Open Access

    Photoinduced Nonthermal Reduction of the Coercive Field in FePt and FePt0.84Rh0.16 Epitaxial Thin Films in the L10 Phase

    The time-resolved magneto-optical Kerr effect in epitaxial thin films of the FePt compound and the FePt0.84Rh0.16 solid solution with the perpendicular magnetic anisotropy on MgO (001) substrates has been studied...

    A. V. Petrov, S. I. Nikitin, L. R. Tagirov, A. S. Kamzin, R. V. Yusupov in JETP Letters (2023)

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  3. No Access

    Article

    Ferromagnetism of Graphite Nanopowders with Cobalt Oxide Impurity and Its Evolution at Moderate Annealing

    A study of the influence of a small impurity of cobalt oxide CoO on the magnetic properties of graphite nanopowder is presented in this article. It is shown that such an impurity is responsible for the weak fe...

    M. Saad, A. G. Kiiamov, S. I. Nikitin… in Inorganic Materials: Applied Research (2023)

  4. No Access

    Article

    Electric Field Effect in ESR Spectra of Fe3+ and Mn4+ Centers in Thin SrTiO3 Plates

    The electric field effect in electron spin resonance spectra of Fe3+ and Mn4+ impurity ions in thin oriented single-crystal plates of strontium titanate has been studied; the crystal structure of these samples at...

    B. F. Gabbasov, A. A. Rodionov, S. I. Nikitin, V. A. Trepakov… in Physics of the Solid State (2021)

  5. No Access

    Article

    Femtosecond Optical and Magneto-Optical Spectroscopy Study of Magnetic and Electronic Inhomogeneities in a Pd0.94Fe0.06 Thin Film

    The results of a femtosecond optical and magneto-optical spectroscopy study of a thin epitaxial film of a low-temperature magnetically soft Pd0.94Fe0.06 alloy on a ({dy001})-MgO substrate are reported. The photoi...

    A. V. Petrov, R. V. Yusupov, S. I. Nikitin, A. I. Gumarov, I. V. Yanilkin… in JETP Letters (2019)

  6. No Access

    Article

    The Spectral and Magnetic Properties of Er3+ and Yb3+ Ions in Y2Ti2O7 Crystals with a Pyrochlore Structure

    Cubic Y2Ti2O7 single crystals doped with Er3+ or Yb3+ ions have been studied by the methods of electron spin resonance (ESR) and selective laser spectroscopy. ESR spectra exhibit signals from rare-earth ions that...

    R. G. Batulin, M. A. Cherosov, I. F. Gil’mutdinov… in Physics of the Solid State (2019)

  7. No Access

    Article

    Ferromagnetism and Persistent Currents in Finely Dispersed Highly Oriented Pyrolytic Graphite Samples

    Synthesis of finely dispersed graphite powders is described and results of their investigations by the methods of electron microscopy and magnetometry are presented. The samples have been prepared from crystal...

    M. Saad, I. F. Gilmutdinov, A. M. Rogov, S. I. Nikitin… in Russian Physics Journal (2018)

  8. No Access

    Article

    Observation of Persistent Currents in Finely Dispersed Pyrolytic Graphite

    The trapped magnetic flux in the finely ground pyrolytic graphite sample annealed at 670 K in air has been observed. Flux trap** occurs on cooling of the sample from room temperature to 10 K in a magnetic fi...

    M. Saad, I. F. Gilmutdinov, A. G. Kiiamov, D. A. Tayurskii, S. I. Nikitin… in JETP Letters (2018)

  9. No Access

    Article

    Selective laser spectroscopy of Mn4+-Mn4+ pair centers in SrTiO3 crystal

    Zero-phonon lines of a pair center of Mn4+ ions are observed in the luminescence and luminescence-excitation spectra of SrTiO3:Mn crystal. Based on the experimental data, the energy-level structure of the ground ...

    L. R. Gilyazov, M. V. Eremin, S. I. Nikitin, R. V. Yusupov… in Optics and Spectroscopy (2014)

  10. No Access

    Article

    First mesogenic derivative of boron difluoride β-enaminoketonate

    Boron difluoride complexes possessing liquid crystalline and luminescent properties were synthesized for the first time on the basis of non-mesogenic β-enaminoketones.

    O. A. Turanova, E. V. Kal’dyaeva, O. I. Gnezdilov… in Russian Journal of General Chemistry (2010)

  11. No Access

    Article

    Eigenvalue problem for bundle of operators and the sturm expansion method in quantum mechanics

    Different variants of the generalized formulation of the eigenvalue problem related to a single-particle Schrödinger equation are considered. The nature of the spectrum of problems for a bundle of operators co...

    S. I. Nikitin, A. I. Sherstyuk in Optics and Spectroscopy (2009)

  12. No Access

    Article

    EPR of Pb3+ ion in LiBaF3 crystals

    Complex EPR spectra of paramagnetic centers Pb3+ formed in LiBaF3:Pb2+ crystals under X-ray irradiation are studied in the temperature range of 10–150 K. It is shown that lead ions substitute Ba2+ ions in the LiB...

    L. K. Aminov, D. G. Zverev, G. V. Mamin, S. I. Nikitin… in Applied Magnetic Resonance (2006)

  13. No Access

    Article

    Multifrequency EPR spectroscopy of Ho3+ ions in synthetic forsterite

    Electron paramagnetic resonance (EPR) of Ho3+ single ions and Ho3+−Mg2+-vacancy-Ho3+ associates in holmium-doped forsterite single crystals are studied at 9.4, 37.3 and 65–250 GHz. Crystals were grown from melt b...

    A. A. Konovalov, D. A. Lis, B. Z. Malkin, S. I. Nikitin… in Applied Magnetic Resonance (2005)

  14. No Access

    Article

    Low-lying states of trinuclear mixed-valence cluster: [Fe3S4]0

    Low-lying energy states of the [Fe3S4]0 cluster have been calculated by taking into account the double exchange, superexchange and vibronic interaction. It was found that the adiabatic potential of the excited st...

    M. V. Eremin, S. I. Nikitin, S. Yu. Prosvirnin in Applied Magnetic Resonance (2002)

  15. No Access

    Article

    Bound S-states of a two-electron atom

    A special selection of the Euler angles is made, according to which one axis of the rotating coordinate system is related to the center of mass of electrons. The hierarchy of the hyperspherical coordinates R, α, ...

    A. A. Kiselev, S. I. Nikitin in Technical Physics Letters (2002)

  16. No Access

    Article

    Luminescence of Tl+ ions in a KZnF3 crystal

    The luminescence spectra of a KZnF3: Tl+ crystal are investigated in the energy range from 4.75 to 5.9 eV at temperatures of 10–300 K upon excitation into the A absorption band (5.7–6.3 eV). At T=300 K, the lumin...

    L. K. Aminov, S. I. Nikitin, N. I. Silkin, R. V. Yusupov in Physics of the Solid State (2002)

  17. No Access

    Article

    EPR and optical spectroscopy of impurities in two synthetic beryls

    Two synthetic beryls (Al2Be3Si6O18) of different color (purple and blue-green) were studied with electron paramagnetic resonance (EPR) and optical spectroscopy. In both crystals, the known spectra of Cu2+ and Fe3...

    J. -M. Gaite, V. V. Izotov, S. I. Nikitin, S. Y. Prosvirnin in Applied Magnetic Resonance (2001)

  18. No Access

    Article

    Microstructure of pair centers of Cr3+-Cr2+ ions in the KZnF3 crystal

    Studies involving the piezospectroscopy method have shown that the symmetry of the pair centers of Cr3+-Cr2+ ions in the KZnF3 crystal is tetragonal. In this paper we develop a microscopic model of a pair center....

    M. V. Eremin, S. I. Nikitin, N. I. Silkin… in Journal of Experimental and Theoretical Ph… (1998)

  19. No Access

    Article

    Electric-field effect in a mixed-valence ion pair Cr3+−Cr2+ in a KZnF3 crystal

    The influence of an external axial electric field on the absorption spectrum of a Cr3+−Cr2+ mixed-valence pair center coupled by the double-exchange mechanism in a KZnF3 crystal is investigated. It is shown exper...

    S. I. Nikitin, R. V. Yusupov, M. V. Eremin… in Journal of Experimental and Theoretical Ph… (1998)