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Mixed State in t-U-J-V Model

100%
Tobijaszewska B., Bak M.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
135-137
EN
The t-U-J-V model in the U → ∞ limit is treated by renormalized mean-field theory for arbitrary electron density. Superconductivity of s+id symmetry is found in the large parts of the phase diagram. Calculations also show a possibility of phase separation.
2
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Phase Fluctuations and BCS-LP Crossover in 2D Short Coherence Length Superconductors

100%
Tobijaszewska B., Micnas R.
Acta Physica Polonica A
|
2000
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vol. 97
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issue 3
393-397
EN
We study the effects of phase fluctuations in 2D short-coherence length superconductors on the basis of the extended Hubbard model with intersite attraction. In the Kosterlitz-Thouless scenario the critical temperatures for anisotropic pairings were determined and compared with the ones from BCS Hartree-Fock approximation. The Uemura-type plots, i.e. the critical temperature vs. zero temperature phase stiffness, were obtained for extended s-wave and d_{x^{2}-y^{2}}-wave pairings. We also discuss the crossover from BCS to local pair superconductivity for d-wave pairing.
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Charge Ordering and Phase Separations in the Spinless Fermion Model with Repulsive Intersite Interaction

81%
Czart W., Robaszkiewicz S., Tobijaszewska B.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
129-134
EN
We study a simple effective model for description of charge orderings in narrow band materials, i.e. the spinless fermion model with repulsive intersite interaction W. The analysis is concentrated on the problem of phase separations and the effects of next-nearest neighbor hopping t_2 on the charge ordered states in this system. The cases of d-dimensional (d≥2) hypercubic lattices are considered for arbitrary particle concentration (0 < n < 1). Within the broken symmetry Hartree-Fock approximation the phase diagrams as a function of W and n are evaluated for representative cases. The results for t_2 ≠ 0 are compared with those found for the case with nearest neighbor hopping only.
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