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Wyświetlanie 1-10 z 54
Tytuł:
One-Dimensional Falicov-Kimball Model in the Strong Coupling Limit
Autorzy:
Farkašovský, P.
Bat'ko, I.
Powiązania:
https://bibliotekanauki.pl/articles/1930516.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
Opis:
We studied the ground state properties of the one-dimensional Falicov-Kimball model in the strong coupling limit for special periodic and aperiodic configurations of ions. The ground state phase diagrams of the model for nearest neighbor and next nearest neighbor hopping are discussed.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 307-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of R$\text{}_{1-x}^{(1)}$R$\text{}^{(2)}$$\text{}_{x}$Al$\text{}_{2}$ Alloys
Autorzy:
Matlak, M.
Ślebarski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1887609.pdf
Data publikacji:
1991-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
Opis:
Using the multiband s-f model we derive the formulae determining the Curie temperature and magnetic moment as functions of concentration x for R$\text{}_{1-x}^{(1)}$R$\text{}_{x}^{(2)}$Al$\text{}_{2}$ intermetallic alloys, where R$\text{}^{1,2}$ denote magnetic rare earth metals. These formulae, applied to R$\text{}_{1-x}^{(1)}$R$\text{}^{(2)}$ alloys (R$\text{}^{(1)}$ = La, Lu, Y, Zr and R$\text{}^{(2)}$ = Gd) give the linear dependence of the Curie temperature and magnetic moment versus x in full agreement with experimental data.
Źródło:
Acta Physica Polonica A; 1991, 79, 5; 721-725
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Separation in Hubbard Model
Autorzy:
Samson, J. H.
Powiązania:
https://bibliotekanauki.pl/articles/1964683.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.25.+z
75.10.Lp
Opis:
The Hartree-Fock ground-state phase diagram of the one-dimensional Hubbard model is calculated in the μ-U plane, restricted to phases with no charge density modulation. This allows antiferromagnetism, saturated ferromagnetism, spiral spin density waves and a collinear structure with unit cell ↑↑↓↓. The spiral phase is unstable against phase separation near quarter-, half- and three-quarter-filling. For large U this occurs at hole (or electron) doping of (3t/π$\text{}^{2}$U)$\text{}^{1}\text{}^{/}\text{}^{3}$ from half-filling.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 363-366
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frustrated Magnetism in Vanadium Oxides
Autorzy:
Thalmeier, P.
Schmidt, B.
Yushankhai, V.
Takimoto, T.
Powiązania:
https://bibliotekanauki.pl/articles/1810285.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.10.Lp
Opis:
The effect of frustration in various localized and itinerant vanadium oxide compounds is discussed within next nearest neighbors Heisenberg and spin fluctuation models, respectively. In the localized moment case the S=1/2 $J_1-J_2$-model on a square lattice exhibits a rich phase diagram with magnetic as well as exotic hidden order phases due to the interplay of frustration and quantum fluctuations. Their signatures in the high field magnetization and in magnetocaloric quantities are surveyed. The possible quantum phase transitions are discussed and applied to layered vanadium oxides of the type $AA'VO(PO_4)_2$ where A, A' = Pb, Zn, Sr, Ba, Cd. In itinerant electron systems magnetic frustration may emerge as a result of electron correlations on a geometrically frustrated lattice. This mechanism causes enhanced spin fluctuations in a large region of momentum space and therefore can lead to a heavy fermion state at low temperatures as in the 3d spinel compound $LiV_2O_4$. The evidence from neutron scattering and NMR experiments is discussed within self-consistent renormalization theory based on local density approximation band structure calculations.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 53-58
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferromagnetic Systems with Hopping Interaction
Autorzy:
Górski, G.
Mizia, J.
Powiązania:
https://bibliotekanauki.pl/articles/1537008.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
75.10.Lp
Opis:
We analyze the influence of hopping interaction on magnetic ordering. Scattering scheme of the Hubbard III approximation with included inter-site kinetic electron-electron correlation is used. The hopping interaction and inter-site correlation lead to two spin dependent effects: the band width correction and the band-shift correction. The band-shift correction factor causes an exchange splitting between the spin-up and spin-down spectrum, and its role is similar to the exchange interaction in the classic Stoner model. The spin dependent band width correction enhanced strongly by the inter-site kinetic correlation lowers the kinetic energy of electrons by decreasing the majority spin band width for some electron occupations with respect to the minority spin band width. The results show that in the case of the symmetrical density of states there is only ferromagnetic enhancement. For the strongly asymmetrical density of states there is a ferromagnetic transition.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 336-339
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferromagnetism in Hubbard Chains
Autorzy:
Cuoco, M.
Noce, C.
Romano, A.
Powiązania:
https://bibliotekanauki.pl/articles/1955828.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
75.10.Lp
Opis:
We analyze the possible occurrence of ferromagnetism in the Hubbard model, by means of an exact diagonalization study performed on 3- to 8-site chains with periodic boundary conditions. In the case of one hole in the half-filled configuration, we find that the Nagaoka state is reached only in the 3- and in the 4-site case. Ground states characterized by unsaturated ferromagnetism are found when the case of more than one hole is considered.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 387-390
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetism in FeRh Alloys
Autorzy:
Pugacheva, M.
Jezierski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1861254.pdf
Data publikacji:
1994-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Pi
75.10.Lp
Opis:
We study the electronic and magnetic properties of FeRh ordered alloys. The electronic structure is calculated by the tight-binding linear muffin-tin orbital method. We observe the decreasing magnetic moment with increase of the ratio c/a during the structural phase transformation from CsCl to CuAu type structure.
Źródło:
Acta Physica Polonica A; 1994, 85, 1; 219-221
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetism Within the Limitations of the LDA Band Structure Calculations
Autorzy:
Szpunar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1929380.pdf
Data publikacji:
1993-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.-s
75.10.Lp
Opis:
We discuss the limitations of the local density approximation for high-temperature superconductors and related to them parent antiferromagnetic insulators. The calculated band-gap accuracy is pointed out for two cases: C$\text{}_{60}$-FCC and YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6}$. We also compare the results for parent CaCuO$\text{}_{2}$ and NiO systems, as well as discuss the role of gradient and self-energy (GW) corrections for the Mott insulators.
Źródło:
Acta Physica Polonica A; 1993, 84, 1; 21-42
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theory of Strongly Correlated Systems in the Limit of Large On-Site Coulomb Repulsion
Autorzy:
Izyumov, Yu. A.
Powiązania:
https://bibliotekanauki.pl/articles/1860989.pdf
Data publikacji:
1994-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
75.30.Cr
Opis:
A strongly correlated electronic system is studied within the framework of the t-J model with the help of diagram technique for the Hubbard X-operators. The summing of some series of diagrams is suggested, corresponding to the following three types of approximations: the generalized random phase approximation, the mean field approximation, and the low density approximation. In generalized random phase approximation the dynamic magnetic susceptibility of paramagnetic phase is calculated, and boundaries of stability of this phase are found on the plane of Hamiltonian parameters and electron concentration n. It is shown that at some critical concentration n$\text{}_{c}$ the system undergoes a crossover from the itinerant magnetism (n < $\text{}n_{c}$) to the magnetism with localized magnetic moments (n > $\text{}n_{c}$). Simultaneously, the system transfers from the Fermi-liquid behaviour to the regime of strong electron correlations with nonquasiparticle states. In mean field approximation equations for the order parameters were derived and phase transitions temperatures in a ferromagnetic and antiferromagnetic phases were obtained. In low density approximation a state of the saturated ferromagnetism was investigated and a critical concentration n$\text{}_{s}$ was calculated when the nonsaturated ferromagnetism follows the saturated ferromagnetism.
Źródło:
Acta Physica Polonica A; 1994, 85, 1; 103-115
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Hofstadter Diagram Analyzed in Terms of the Band Structure Parameters for a Planar Metal
Autorzy:
Roliński, T.
Olszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2046841.pdf
Data publikacji:
2006-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
75.70.-i
Opis:
It is demonstrated that a wing of the Hofstadter diagram calculated for the tightly-bound s-electrons in the simple cubic lattice can be reproduced by the dispersion figure of the wave-vector square considered for the electron states of the same lattice, on the condition that the states having equal energies are taken into account. The dispersion splitting increases systematically with the distance of the states from the Brillouin zone center. A similar wing due to dispersion of the electron momentum is calculated also for the s-electron states in the body-centered cubic lattice.
Źródło:
Acta Physica Polonica A; 2006, 109, 6; 753-759
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 54

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