Перегляд за автором "Freiman, Yu.A."

Сортувати за: Порядок: Результатів:

  • Broken symmetry phase transition in solid HD: a manifestation of quantum orientational melting 
    Freiman, Yu.A.; Tretyak, S.M.; Jezowski, A.; Hemley, R.J. (Физика низких температур, 1998)
    Theoretical study of the broken symmetry phase (BSP) transition line in solid HD reveals that its anomalous features provide evidence for quantum orientational melting. The observations of unusual reentrant behavior is a ...
  • Lattice distortion in hcp rare gas solids 
    Grechnev, A.; Tretyak, S.M.; Freiman, Yu.A. (Физика низких температур, 2010)
    The lattice distortion parameter δ≡c/a – √8/3 has been calculated as a function of molar volume for the hcp phases of He, Ar, Kr, and Xe. Results from both semi-empirical potentials and density functional theory are ...
  • Lattice distortion of quantum cryocrystals under pressure 
    Tretyak, S.M.; Antsygina, T.N.; Freiman, Yu.A. (Физика низких температур, 2006)
    The hcp lattice distortion parameter δ, the deviation of c/a ratio from the ideal hcp value √ 8/3 , have been calculated for solid He under pressure taking into account two- and three-body interatomic forces. The resulting ...
  • Low-temperature anomalies in the magnetic and thermal properties of molecular cryocrystals doped with oxygen impurity 
    Freiman, Yu.A.; Tretyak, S.M.; Jeżowski, A. (Физика низких температур, 2000)
    The magnetic properties of oxygen pair clusters are investigated theoretically for different cluster geometries which can be realized by doping molecular cryomatrices with oxygen. Anomalous temperature and pressure behavior ...
  • Many-body interactions and high-pressure equations of state in rare-gas solids 
    Freiman, Yu.A.; Tretyak, S.M. (Физика низких температур, 2007)
    The T 0K equations of state (EOS) of rare-gas solids (RGS) (He, Ne, Ar, Kr, and Xe) are calculated in the experimentally studied ranges of pressures accounting for two- and three-body interatomic forces. Solid-state ...
  • Molecular rotation in p-H₂ and o-D₂ in phase I under pressure 
    Freiman, Yu.A.; Tretyak, S.M.; Goncharov, A.F.; Mao, H.; Hemley, R.J. (Физика низких температур, 2011)
    The orientational order parameter, rotational ground-state energy, and lattice distortion parameter (the deviation of the c/a ratio from the ideal hcp value 1.633) in hcp lattice of phase I of p-H₂ and o-D₂ are calculated ...
  • Poisson’s ratio in cryocrystals under pressure 
    Freiman, Yu.A.; Grechnev, A.; Tretyak, S.M.; Goncharov, Alexander F.; Gregoryanz, Eugene (Физика низких температур, 2015)
    We present results of lattice dynamics calculations of Poisson’s ratio (PR) for solid hydrogen and rare gas solids (He, Ne, Ar, Kr and Xe) under pressure. Using two complementary approaches — the semi-empirical many-body ...
  • Quantum rotors in Pca2₁ lattice 
    Freiman, Yu.A.; Grechnev, Alexei (Физика низких температур, 2016)
    Analytical calculations of the potential barrier hindering rotation of the hydrogen molecules in the molecular field of neighboring molecules are performed for molecular solid hydrogen. The calculations are made for the ...
  • Sound velocities in solid hydrogen under pressure 
    Freiman, Yu.A.; Grechnev, Alexei; Tretyak, S.M.; Goncharov, Alexander F.; Hemley, Russell J. (Физика низких температур, 2013)
    We present results of semi-empirical lattice dynamics calculations of the sound velocities in solid hydrogen under pressure based on the many-body intermolecular potential and first-principle density-functional theory ...
  • Thermal conductivity of solid oxygen, nitrogen, and their solid solutions 
    Freiman, Yu.A.; Sumarokov, V.V.; Owski, A. Jez.; Stachowiak, P.; Mucha, J. (Физика низких температур, 1996)