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Wyszukujesz frazę "Balcerzak, T.A." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-7 z 7
    Tytuł:
    The Phase Diagram of the Second-Type Antiferromagnet
    Autorzy:
    Balcerzak, T.
    Radomska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013394.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.-b
    75.50.Ee
    75.50.Pp
    Opis:
    We investigate theoretically the phase diagrams of the second-type antiferromagnet with the fcc structure. Besides the nearest-neighbour and next-nearest-neighbour exchange interactions, the biquadratic and long-range dipolar terms are taken into account. The results can be useful to discuss the phase diagram of europium telluride under external pressure.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 775-778
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Calculations of EuTe Magnetic Phase Diagram for External Pressure
    Autorzy:
    Radomska, A.
    Balcerzak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014065.pdf
    Data publikacji:
    2000-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.-b
    75.50.Pp
    75.50.Ee
    Opis:
    The magnetic phase diagram of europium telluride, EuTe, under external high pressure is theoretically investigated. Besides nearest-neighbour and next-nearest-neighbour exchange interactions, the long-range dipolar and biquadratic interactions are taken into account. The functional dependences of these interactions on the lattice constant are proposed. The calculated Néel and Curie temperatures are compared with the experimental data. Two new phases, antiferrimagnetic and ferrimagnetic, have been found at a high pressure and low temperatures.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 1-2; 83-91
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frustration in a Mixed-Spin Ising Model With Multi-Spin Interactions
    Autorzy:
    Jaščur, M.
    Štubňa, V.
    Szalowski, K.
    Balcerzak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199553.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    5.50.+q
    75.10.Hk
    Opis:
    In this work we investigate a mixed spin-1/2 and spin-1 Ising model on a decorated square lattice. In addition to standard pair interactions between nearest neighbors, we also consider in our calculations three-site four-spin interactions and the effect of single ion anisotropy. Applying the well-known decoration-iteration transformation, we derive a simple relation between the partition function of the model under investigation and the Onsager's partition function for the simple square lattice. With the help of this mapping relation we are able to calculate exact expressions for all relevant physical quantities of the system (for example, the magnetization, internal energy, Gibbs free energy, entropy and specific heat). The most interesting results have been found in the model without pair interactions. In this case, besides the standard ordered and disordered phases, there also appears an interesting phase which is ordered only partially. Analyzing relevant physical quantities of the system, we have found that the partial ordering is closely related to very strong frustrations that lead to non-zero entropy at T=0.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 48-49
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ground-State Phase Diagram of a Model FCC Magnet with Modified RKKY Interaction
    Autorzy:
    Szałowski, K.
    Balcerzak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813773.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.10.-b
    75.30.Hx
    75.30.Kz
    Opis:
    The ground-state phase diagram is studied for a diluted model magnet with FCC structure and modified Ruderman-Kittel-Kasuya-Yosida interaction. The modification consists in taking into account the exponential damping for the long-range interaction as well as the nearest-neighbors antiferromagnetic superexchange couplings. The existence of paramagnetic, ordered ferromagnetic and three distinct antiferromagnetic phases is shown. The stability areas of the phases upon the free-carriers concentration are investigated.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 421-424
    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:
    Ferromagnetic Transition in $Ge_{1-x}Mn_{x}Te$ Layers
    Autorzy:
    Knoff, W.
    Domukhovski, V.
    Dybko, K.
    Dziawa, P.
    Jakieła, R.
    Łusakowska, E.
    Reszka, A.
    Świątek, K.
    Taliashvili, B.
    Story, T.
    Szałowski, K.
    Balcerzak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791343.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Et
    81.15.Hi
    Opis:
    Ferromagnetic transition temperature in thin layers of diluted magnetic (semimagnetic) semiconductor $Ge_{1-x}Mn_{x}Te$ was studied experimentally by SQUID magnetometry method and analyzed theoretically for a model Ising-type diluted magnetic system with Ruderman-Kittel-Kasuya-Yosida indirect exchange interaction. The key features of the experimentally observed dependence of the Curie temperature on Mn content (x ≤ 0.12) and conducting hole concentration p = (1-10) × $10^{21} cm^{-3}$ were reproduced theoretically for realistic valence band and crystal lattice parameters of p-$Ge_{1-x}Mn_{x}Te$ taking into account short carrier mean free path encountered in this material and Ruderman-Kittel-Kasuya-Yosida mechanism with both delta-like and diffused character of spatial dependence of the exchange coupling between magnetic ions and free carriers.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 904-906
    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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