Autor: Moskvin, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Phase Separation in the Ground State of the Model 2D Spin-Pseudospin System
Autorzy:: Chikov, A.
Panov, Yu.
Moskvin, A.
Budrin, K.
Powiązania:: https://bibliotekanauki.pl/articles/1030463.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.25.Dk
74.81.-g
Opis:: We addressed a simplified static 2D spin-pseudospin model which takes into account both conventional Heisenberg spin exchange coupling and the on-site and inter-site charge correlations. Classical Monte-Carlo calculations for large square lattices show that homogeneous ground state solutions found in a mean-field approximation are unstable with respect to phase separation with the charge and spin subsystems behaving like immiscible quantum liquids. For instance, with lowering the temperature one can observe two sequential phase transitions: first, antiferromagnetic ordering in the spin subsystem diluted by randomly distributed charges, then, the charge condensation in the charge droplets. Thermodynamic properties and phase diagram of the 2D spin-pseudospin system are studied by Monte-Carlo simulation with a special attention given to the role played by the on-site correlation.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 432-434
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Strongly Anisotropic S=1 (Pseudo) Spin Systems: from Mean Field to Quantum Monte-Carlo
Autorzy:: Panov, Yu.
Moskvin, A.
Konev, V.
Vasinovich, E.
Ulitko, V.
Powiązania:: https://bibliotekanauki.pl/articles/1030506.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.10.Hk
75.10.Jm
74.25.Dw
Opis:: The S=1 pseudospin formalism was recently proposed to describe the charge degree of freedom in a model high-T_{c} cuprate with the on-site Hilbert space reduced to the three effective valence centers, nominally Cu^{1+;2+;3+}. With small corrections the model becomes equivalent to a strongly anisotropic S=1 quantum magnet in an external magnetic field. We have applied a generalized mean-field approach and quantum Monte-Carlo technique for the model 2D S=1 system to find the ground state phase with its evolution under deviation from half-filling and different correlation functions. Special attention is given to the role played by the on-site correlation ("single-ion anisotropy").
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 426-428
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: New approach to the determination of phase equilibrium in the Zn-Te system
Autorzy:: Moskvin, P.
Olchowik, J.
Olchowik, G.
Zdyb, A.
Gulkowski, S.
Sadowski, W.
Powiązania:: https://bibliotekanauki.pl/articles/1934011.pdf
Data publikacji:: 2011
Wydawca:: Politechnika Gdańska
Tematy:: phase equilibria
solubility
liquid phase epitaxy
II-VI semiconductor compound
Opis:: The polyassociative model of the liquid phase was applied to describe the phase equilibrium in the Zn-Te system. The thermodynamic functions describing the formation of liquid associates were obtained, taking into account the experimental data on the p-T-x equilibrium in the system. The model of polyassociative solutions with the parameters obtained in this work satisfactorily describes the p-T-x diagram of the system. The numerical results of the analysis of the phase equilibrium confirmed the possibility of applying the polyassociative model to the Zn-Te system in a wide temperature range.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 2; 209-217
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Mesomorphic Properties and Computer Simulation of Guanazole Derivatives and Their Mixtures
Autorzy:: Moskvin, D.
Sotsky, V.
Danilova, E.
Kudayarova, T.
Smirnova, A.
Usol'tseva, N.
Powiązania:: https://bibliotekanauki.pl/articles/1192351.pdf
Data publikacji:: 2015-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.70.Ns
65.90.+i
Opis:: An investigation of the mesomorphic properties of 3,5-diamino-1-dodecyl-1,2,4-triazole and 3-amino-1,5-dodecyl-1,2,4-triazole binary mixture in the ratio of 1:0.75 (four molecules of the first compound and three of the second) was performed. By means of polarizing optical microscopy, it was discovered that the experimentally obtained binary mixture possesses enantiotropic mesomorphic properties (SmA phase). With the help of the molecular dynamics simulation of both individual triazole derivatives and their binary mixture, it was shown that the SmA-mesophase is caused by the presence of the di-dodecyl substituted triazole derivative.
Źródło:: Acta Physica Polonica A; 2015, 127, 4; 950-952
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Polyassociative model of A2B6 semiconductor melt and p-T-x phase equilibria in Zn-Cd-Te system
Autorzy:: Moskvin, P.
Antonov, M.
Olchowik, G.
Olchowik, J.
Zdyb, A.
Gulkowski, S.
Sadowski, W.
Powiązania:: https://bibliotekanauki.pl/articles/1934030.pdf
Data publikacji:: 2011
Wydawca:: Politechnika Gdańska
Tematy:: phase equilibria
solubility
liquid phase epitaxy
semiconducting II-VI materials
Opis:: This work presents a numerical analysis of p-T-x phase equilibrium in the Zn-Cd-Te ternary system in the framework of the polyassociative solution model. On the basis of the experimental data on p-T-x phase equilibrium in the ternary system, thermodynamic functions describing the formation of liquid associates were found. It was shown that the results of the mixing of components in the Zn-Cd-Te ternary melt are related to the occurrence of ZnCdTe and ZnCdTe3 associates. Dissociation parameters of these complexes were calculated and subsequently used in order to efficiently describe p-T-x phase equilibrium of the system in a wide temperature range.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 1; 121-130
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

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