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Information × Registration Number 0220U102152, 0116U007065 , R & D reports Title Research of classical and quantum symmetries in the theoretical-field and string models and problems of statistical mechanics of the condensed media popup.stage_title Head Sliusarenko Yurii V., Registration Date 10-03-2020 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2  There has been solved the problem of classification of the equilibrium states of magnets with spin s=1 in the case of spontaneous breaking of magnetic SU(3) symmetry caused by antiferromagnetic parameter and the order parameter of spin nematic. There were formulated classification equations for these order parameters. Their particular and general solutions have been found in terms of the vector and tensor of spontaneous magnetic anisotropy. There were obtained low-frequency asymptotics of two-time Green functions for two arbitrary local physical quantites in the states of quadrupole magnet, ferrimagnet and spin nematic. There has been carried out the comparative analysis of the found Green functions’ asymptotics for arbitrary local physical quantities in the case of magnets with various unitary symmetry of exchange interaction. There have been studied low-temperature phases of the recently synthesized Sr2CoO3F compound under pressure. The analysis combining local density approximation with the mean field dynamical theory and effective model derived in the limit of strong coupling points on the existence of not only normal paramagnetic and antiferromagnet regimes but also on the existence of the phase of ordered spin states of electrons in certain range of applied pressure and low temperature. This ordering is characterized by variable location of different spin states of cobalt atoms in the lattice of chessboard type. Product Description popup.authors Ковалевський Михайло Юрійович Matskevych Valentina T Sliusarenko Yurii V. Sotnikov Andrii H Uvarov Dmytro V Shulga Sergey M. popup.nrat_date 2020-04-02 Close