Honorary issue dedicated to the 70-th anniversary of Professor Ihor Stasyuk

ЗМІСТ

Honorary issue dedicated to the 70-th anniversary of Professor Ihor Stasyuk

Vakarchuk I.O.
Theory of radiation and absorption of deformed field quanta

Yevych R.M., Vysochanskii Yu.M.
The second order phase transition in Sn₂P₂S₆ crystals: anharmonic oscillator model

Shvaika A.M., Freericks J.K.
F-electron spectral function of the Falicov-Kimball model and the Wiener-Hopf sum equation approach

Didukh L., Skorenkyy Yu., Kramar O.
Electron correlations in narrow energy bands: modified polar model approach

Spałek J.
Effective t-J model of pairing: singlet versus triplet

Tkach M.V., Seti Ju.O., Voitsekhivska O.M.
Evolution of quasistationary electron spectrum in open spherical quantum dot

Grigas J., Talik E., Lazauskas V., Vysochanskii Yu.M., Yevych R., Adamiec M., Nelkinas V.
X-ray photoelectron spectroscopy of Sn₂P₂S₆ crystals

Loktev V.M., Turkowski V.
Spin fluctuations and the "strange metal" behavior of a weakly doped antiferromagnet

Plakida N.M., Oudovenko V.S.
Electronic spectrum and superconductivity in Hubbard model

Ivanova I.M., Kalita V.M., Pashkov V.O., Loktev V.M.
Quantum phase transition: Van Vleck antiferromagnet in a magnetic field

Levitsky R.R., Sorokov S.I., Stankowski J., Trybula Z., Vdovych A.S.
Thermodynamics and complex dielectric permittivity of mixed crystals of the Rb_1-x(NH₄)_xH₂PO₄ type

Mancini F., Mancini F.P.
Magnetic and thermal properties of a one-dimensional spin-1 model

Levitskii R.R., Zachek I.R., Moina A.P., Vdovych A.S.
Longitudinal relaxation of mechanically free KH₂PO₄ type crystals. Piezoelectric resonance and sound attenuation

Slivka A.G., Kedyulich V.M., Guyvan H.M.
External field effect on the anisotropy of dielectric permeability of KH₂PO₄ and NaKC₄H₄O₆·4H₂O crystals under high pressure