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    Wyświetlanie 1-7 z 7
    Tytuł:
    Theoretical Study of the Frustrated Ising Antiferromagnet on the Honeycomb Lattice
    Autorzy:
    Bobák, A.
    Lučivjanský, T.
    Žukovič, M.
    Borovský, M.
    Balcerzak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032632.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.50.+q
    05.70.-a
    75.10.Hk
    Opis:
    We study effects of the next-next-nearest-neighbour antiferromagnetic (J₃ < 0) interaction on critical properties (or phase diagram) of the frustrated spin-½ J₁-J₂-J₃ Ising antiferromagnet on the honeycomb lattice by using the effective-field theory with correlations. Beside the ground-state energy, we find that there is a region of J₃ < 0 in which the frustrated honeycomb lattice antiferromagnet exhibits a tricritical point, at which the phase transition changes from the second order to the first one on the line between Néel antiferromagnetic and paramagnetic phases.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 636-638
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhanced magnetocaloric effect due to selective dilution in a triangular ising antiferromagnet
    Autorzy:
    Borovský, M.
    Žukovič, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054817.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.50.+q
    75.50.Ee
    75.30.Sg
    05.10.Ln
    Opis:
    We employ an effective-field theory with correlations in order to study a magnetocaloric effect on a triangular Ising antiferromagnet, which is selectively diluted by non-magnetic impurities on one of the three sublattices. Such a dilution generally relieves massive degeneracy in our system and therefore the ground-state entropy diminishes and the magnetocaloric effect weakens at low temperatures. However, at relatively higher temperatures we can observe significantly enhanced negative isothermal entropy changes for the sublattice concentration p_A=0.8.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 645-647
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization and Susceptibility of a Diluted Triangular Ising Antiferromagnet in a Field
    Autorzy:
    Borovský, M.
    Žukovič, M.
    Bobák, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199489.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.50.+q
    64.60.De
    75.10.Hk
    75.50.Ee
    Opis:
    Within the framework of the effective-field theory with correlations we investigate effects of an external magnetic field and random site dilution on basic thermodynamic quantities, such as the magnetization and the magnetic susceptibility, on the geometrically frustrated triangular lattice Ising antiferromagnet. Behavior of these quantities is presented in the temperature-field parameter space for selected mild degrees of dilution. It is found that, besides the anomalies associated with phase transitions from the ferrimagnetic to the paramagnetic state, in certain regions of the parameter space these functions display some more anomalies and peculiarities, as a result of joint effects of the geometrical frustration, magnetic dilution, thermal fluctuations and the applied magnetic field.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 16-17
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low-Temperature Properties of Ising Antiferromagnet on a Stacked Triangular Lattice
    Autorzy:
    Žukovič, M.
    Mižišin, L.
    Bobák, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199547.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.50.+q
    64.60.De
    75.10.Hk
    75.50.Ee
    Opis:
    An Ising antiferromagnet on a stacked triangular lattice in zero field is studied by Monte Carlo simulations, focusing on the character of the low-temperature phase and the effect of the relative strength of the exchange interaction in the stacking direction α. Our results support the presence of the 3D Wannier phase, with the sublattice magnetization structure (m, -m, 0) and power-law decaying m with the lattice size. The extent of this low-temperature phase shrinks with decreasing α, however, it appears even at very low values if it is accessed from higher temperatures by sufficiently slow cooling.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 40-41
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Study of a Spin-3/2 Blume-Emery-Griffiths Model on a Honeycomb Lattice
    Autorzy:
    Žukovič, M.
    Jaščur, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199541.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.50.+q
    64.60.De
    75.10.Hk
    75.30.Kz
    75.50.Lk
    Opis:
    We study the phase diagram of the spin-3/2 Blume-Emery-Griffiths model on a honeycomb lattice by Monte Carlo simulations in order to verify the presence of some peculiar features predicted by the effective field theory (EFT) with correlations. The locations of the order-disorder phase boundaries are estimated from thermal variations of the magnetic susceptibility curves. It is found that for positive values of the biquadratic interactions the critical boundary shows a discontinuous character as a function of the single-ion anisotropy strength, in line with the EFT expectations. However, for negative values of the biquadratic interactions the step-like variation of the critical frontier predicted by EFT was not reproduced.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 36-37
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exact Diagonalization Study of an Extended Hubbard Model for a Cubic Cluster at Quarter Filling
    Autorzy:
    Szałowski, K.
    Balcerzak, T.
    Jaščur, M.
    Bobák, A.
    Žukovič, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032794.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.75.-c
    75.10.Lp
    71.27.+a
    65.80.-g
    05.70.Ce
    Opis:
    In the paper the thermodynamics of a cubic cluster with 8 sites at quarter filling is characterized by means of exact diagonalization technique. Particular emphasis is put on the behaviour of such response functions as specific heat and magnetic susceptibility. The system is modelled with extended Hubbard model which includes electron hopping between both first and second nearest neighbours as well as Coulombic interactions, both on-site and between nearest-neighbour sites. The importance of hopping between second nearest neighbours and Coulombic interactions between nearest neighbours for the temperature dependences of thermodynamic response functions is analysed. In particular, the predictions of the Schottky model are compared with the calculations based on the full energy spectrum.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1012-1014
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ordering in Triangular Lattice Ising Antiferromagnet Due to Dilution and Magnetic Field
    Autorzy:
    Žukovič, M.
    Borovský, M.
    Bobák, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506982.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.50.+q
    64.60.De
    75.10.Hk
    75.30.Kz
    75.50.Ee
    75.50.Lk
    Opis:
    We study effects of an external magnetic field and random site dilution on the magnetic ordering in the geometrically frustrated triangular lattice Ising antiferromagnet by the use of an effective-field theory with correlations. In particular, we find that already a small amount of the quenched dilution locally relieves the frustration which in the presence of the external field is manifested by multiple splitting of a broad frustration-induced 1/3 magnetization plateau. Depending on the field strength, the dilution can either decrease or increase the magnetization or even change its effect from decreasing to increasing.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 740-741
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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