Temat: Cx - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: KEr(MoO$\text{}_{4}$)$\text{}_{2}$ and CsDy(MoO$\text{}_{4}$)$\text{}_{2}$ - Low-Dimensional Ising Magnets
Autorzy:: Kačmár, M.
Orendáčová, A.
Čizmár, E.
Horváth, D.
Orendáč, M.
Bondarenko, V.
Anders, A. G.
Feher, A.
Jaščur, M.
Powiązania:: https://bibliotekanauki.pl/articles/2013657.pdf
Data publikacji:: 2000-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.40.Cx
75.10.Hk
75.40.Mg
Opis:: In the present work the behaviour of cluster excitations in magnetic field, B, parallel to the easy axis was experimentally studied by the measurements of KEr(MoO$\text{}_{4}$)$\text{}_{2}$ and CsDy(MoO$\text{}_{4}$)$\text{}_{2}$ specific heat, C, vs. B dependence studied at a constant temperature. Corresponding Monte Carlo simulations of C revealed that despite of the fact that the Ising exchange-coupling models proved useful for a sufficient description of the specific heat of these dipolar systems in B=0, the analysis of current experimental data requires a partial renormalization of exchange-coupling constants previously obtained from B=0 analysis. The influence of crystal field effects and long-range character of spin correlations is discussed.
Źródło:: Acta Physica Polonica A; 2000, 97, 5; 807-810
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: The Numerically Generated Series Expansions for Spin-Lattice Systems
Autorzy:: Musiał, G.
Powiązania:: https://bibliotekanauki.pl/articles/2013729.pdf
Data publikacji:: 2000-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.60.-x
75.10.Hk
75.40.Cx
Opis:: The numerically generated series expansions complementary to widely used computer simulations of the Monte Carlo type, are presented. The effective algorithm for generation of graphs, which constitute the basis of series expansions for spin-lattice systems, is introduced. The use of the numerically generated series expansions to calculate the free energy for the eight-vertex model is explained and discussed in detail.
Źródło:: Acta Physica Polonica A; 2000, 97, 5; 901-904
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Spontaneous Magnetization and Phase Diagrams of the Mixed Spin-1/2 and Spin-S Ising Model on the Bethe Lattice
Autorzy:: Strečka, J.
Ekiz, C.
Powiązania:: https://bibliotekanauki.pl/articles/1032659.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.50.+q
75.10.Hk
75.10.Kz
75.40.Cx
Opis:: The effect of uniaxial single-ion anisotropy on magnetic and critical properties of the mixed spin-1/2 and spin-S (S>1/2) Ising model on a three-coordinated Bethe lattice is rigorously examined with the help of star-triangle transformation and exact recursion relations. In particular, our attention is focused on the ferrimagnetic version of the model, which exhibits diverse temperature dependences of the total and both sublattice magnetizations. It is shown that the critical behavior of the mixed-spin Ising model on the Bethe lattice basically depends on whether the quantum spin number S is integer or half-odd-integer.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 615-617
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Exchange Interactions in a Low-Dimensional Magnetic System $Cu(H_{2}O)_{2}(en)SO_{4}$
Autorzy:: Sýkora, R.
Legut, D.
Wdowik, U.
Powiązania:: https://bibliotekanauki.pl/articles/1366514.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.10.Hk
75.10.-b
75.40.Cx
75.50.Ee
Opis:: We report a theoretical ab-initio investigation of the exchange interaction between Cu atoms in $Cu(H_{2}O)_{2}(en)SO_{4}$, en=$C_{2}H_{8}N_{2}$(ethylenediamine), an insulating magnetic material. Unlike previous experimental studies which describe the system as a quasi-two-dimensional antiferromagnet, our results, based on the mapping of the system onto an effective Heisenberg model, suggest a quasi-one-dimensional character of magnetism, with the exchange coupling between the Cu atoms being propagated along a zigzag line, lying in the crystal's bc plane and connecting the Cu atoms through the N atoms. Furthermore, we report the calculated positions of the H atoms that have not been provided in experimental papers.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 50-51
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: On Non-Ising Phase Transitions in the 3D Standard Ashkin-Teller Model
Autorzy:: Jeziorek-Knioła, D.
Musiał, G.
Dębski, L.
Rogiers, J.
Dylak, S.
Powiązania:: https://bibliotekanauki.pl/articles/1427129.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.10.Hk
75.30.Kz
75.40.Cx
75.40.Mg
Opis:: The phase transition line near the Ising point region is studied for the 3D standard Ashkin-Teller model on a cubic lattice. This model with a multicomponent order parameter is one of the important reference points in statistical physics since it shows an interesting and complicated phase diagram. The main motivation for our study was nonuniversal behavior suggested for this line. The large-scale Monte Carlo simulations using the Binder and Challa like cumulants are performed. Accurate analysis to exclude the latent heat inherence is applied. Specific behavior of the Challa like cumulants is discovered and its interpretation is proposed. The paper is closed with preliminary conclusions concerning the continuous but non-Ising character of these phase transitions in the lower part of the mixed phase region and the possiblity of the first order on the line connecting it to the Ising point.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1105-1107
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Effective Field Methods for Magnetic Systems
Autorzy:: Kamieniarz, G.
Dekeyser, R.
Musiał, G.
Powiązania:: https://bibliotekanauki.pl/articles/1930600.pdf
Data publikacji:: 1994-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.60.Cn
64.60.Fr
05.50.+q
75.10.Dg
75.10.Hk
75.10.Jm
75.40.Cx
75.40.Mg
Opis:: The self-consistency conditions inherent in the mean-field approximation are extended to take into account some pair correlations. Ii is shown that this extension is systematically improvable and applicable to the spin systems with short-range interactions in the entire temperature region. With two correlations included and the renormalization-group ideas implemented, the critical properties of the Ising model are satisfactorily revealed. Moreover, the improved estimates of the thermodynamical quantities for the quantum linear XY model from the finite-size calculations are found down to very low temperatures.
Źródło:: Acta Physica Polonica A; 1994, 85, 2; 413-417
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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