Перегляд за автором "Loktev, V.M."

Сортувати за: Порядок: Результатів:

  • Adatom interaction effects in surface diffusion 
    Gaididei, Yu.B.; Loktev, V.M.; Naumovets, A.G.; Zagorodny, A.G. (Condensed Matter Physics, 2013)
    Motivated by recent research of Nikitin et al. [J. Phys. D: Appl. Phys., 2009, 49, 055301], we examine the effects of interatomic interactions on adatom surface diffusion. By using a mean-field approach in the random walk ...
  • Boundary friction on molecular lubricants: rolling mode? 
    Loktev, V.M.; Pogorelov, Yu.G. (Физика низких температур, 2004)
    A theoretical model is proposed for low-temperature friction between two smooth rigid solid surfaces separated by lubricant molecules, admitting their deformations and rotations. The appearance of different modes of ...
  • Conventional and unconventional impurity effects in superconductors 
    Pogorelov, Yu.G.; Loktev, V.M. (Физика низких температур, 2018)
    A survey is done on the effects of impurities in different types of superconductors, both conventional and unconventional, on their electronic spectra and physical properties. These effects can be generally divided on the ...
  • Doping-dependent superconducting properties of two-dimensional metals with different types of interparticle coupling (Review Article) 
    Loktev, V.M.; Turkowski, V.M. (Физика низких температур, 2004)
    The superconducting properties of a two-dimensional metallic system with arbitrary carrier density and both local and various types of the indirect boson-exchange attractive interaction in the cases of s- and d-wave ...
  • Effect of electron-magnon coupling on the electronic spectrum of weakly doped high-Tc compounds 
    Ivanov, M.A.; Loktev, V.M.; Pogorelov, Yu.G. (Физика низких температур, 1998)
    A theoretic analysis of magnon-induced damping Г of quasiparticle states in the normal phase of doped copper-oxide high-Tc materials is developed, based on a microscopic model which accounts for the specific 2D structure ...
  • Effect of next-to-nearest neighbor hopping on electronic properties of graphene 
    Suprunenko, Y.F.; Gorbar, E.V.; Sharapov, S.G.; Loktev, V.M. (Физика низких температур, 2008)
    In the tight-binding approximation, we take into account the next-to-nearest neighbor hopping in graphene that leads to nonrelativistic-like corrections in its low energy spectrum. The electronic density of states in a ...
  • Formation of d-wave superconducting order in a randomly doped lattice 
    Loktev, V.M.; Pogorelov, Yu.G. (Физика низких температур, 2001)
    We consider the interplay between superconducting coupling and dopant impurity scattering of charge carriers in planar square lattice systems and examine the physical conditions (doping level, temperature, local ...
  • Graphene and graphene-based nanostructures 
    Krive, I.V.; Loktev, V.M.; Shekhter, R.I. (Физика низких температур, 2008)
    This issue of the journal «Fizika Nizkikh Temperatur» is dedicated to the discovery of graphene — a monolayer graphite — in 2004.
  • Green function of fermions in 2D superconducting Frohlich model with inhomogeneous order parameter 
    Loktev, V.M.; Turkowski, V.M. (Физика низких температур, 2000)
    The fermion Green function and spectral characteristics for the 2D Frohlich model of superconductivity at static fluctuations in the phase of the order parameter are calculated. The results demonstrate strongly non-Fermi-liquid ...
  • Impurity and vacancy effects in graphene 
    Loktev, V.M.; Pogorelov, Yu.G. (Физика низких температур, 2012)
    A Green function analysis has been developed for quasiparticle spectrum of a 2D graphene sheet in presence of different types of substitutional disorder, including vacancies. The anomalous character of impurity effects ...
  • Impurity effects in quasiparticle spectrum of high-Tc superconductors 
    Pogorelov, Yu.G.; Santos, M.C.; Loktev, V.M. (Физика низких температур, 2011)
    The revision is made of Green function methods that describe the dynamics of electronic quasiparticles in disordered superconducting systems with d-wave symmetry of order parameter. Various types of impurity perturbations ...
  • Impurity induced Dirac point smearing in graphene 
    Skrypnyk, Yu.V.; Loktev, V.M. (Физика низких температур, 2007)
    It is shown that in a two-dimensional system with the linear dispersion a resonance is present in the Dirac point vicinity, when the impurity perturbation magnitude exceeds the bandwidth. The corresponding spectrum rea ...
  • Magnetoelastic coupling and possibility of spintronic electromagnetomechanical effects 
    Gomonay, H.V.; Kondovych, S.V.; Loktev, V.M. (Физика низких температур, 2012)
    Nanoelectromagnetomechanical systems (NEMMS) open up a new path for the development of high speed autonomous nanoresonators and signal generators that could be used as actuators, for information processing, as elements ...
  • On temperature versus doping phase diagram of high critical temperature superconductors 
    Loktev, V.M.; Turkowski, V.M. (Condensed Matter Physics, 1998)
    An attempt to describe the bell-shape dependence of the critical temperature of high-T<sub>c</sub> superconductors on the charge carrier density is made. It is proposed to explain its linear increase in the region of ...
  • On the orientational relief of the intermolecular potential and the structure of domain walls in fullerite C₆₀ 
    Khalack, J.M.; Loktev, V.M. (Физика низких температур, 2003)
    A simple planar model for an orientational ordering of threefold molecules on a triangular lattice modeling a close-packed (111) plane of fullerite is considered. The system has 3-sublattice ordered ground state which ...
  • On the possible reason for superconductivity strengthening in multiwall carbon nanotubes 
    Gaididei, Yu.B.; Loktev, V.M. (Физика низких температур, 2006)
    Basing on the structural peculiarity of two-layer graphene which consists of translational and energetical nonequivalency of carbon atoms from different sublattices, it is shown that the density of long-wave electronic ...
  • On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet 
    Gomonaj, E.V.; Loktev, V.M. (Физика низких температур, 1999)
    Macroscopic magnetoelastic domain structure of the defectless layered antiferromagnet of CoCl₂-type with the "easy-plane" magnetic anisotropy is studied theoretically in the framework of phenomenological approach. In ...
  • On the theory of high-Tc superconductivity of doped cuprates 
    Pogorelov, Y.G.; Loktev, V.M. (Condensed Matter Physics, 2018)
    A theoretical analysis is presented on possible effects of disorder by dopants in high-temperature superconducting cuprate perovskites, to define their basic spectra of spin and electronic excitations, and the subsequent ...
  • On the theory of the Schrödinger equation with the full set of relativistic corrections 
    Eremko, A.A.; Brizhik, L.S.; Loktev, V.M. (Физика низких температур, 2018)
    All relativistic corrections to the Scrödinger equation which determine the interlink between spin and orbit of moving particles, are directly calculated from the Dirac equation using the spin invariant operators. It is ...
  • Phase fluctuations and pseudogap properties: influence of nonmagnetic impurities 
    Loktev, V.M.; Quick, R.M.; Sharapov, S.G. (Физика низких температур, 2000)
    The presence of nonmagnetic impurities in a 2D “bad” metal depresses the superconducting Berezinskii–Kosterlitz–Thouless transition temperature while leaving the pairing energy scale unchanged. Thus the region of the ...