41 citations · 390 across the 29 of their papers we have counts for
6 papers · 1 filter
Hubbard pair cluster in the external fields. Studies of the chemical potential
T. Balcerzak, K. Szałowski
The chemical potential of the two-site Hubbard cluster (pair) embedded in the external electric and magnetic fields is studied by exact diagonalization of the Hamiltonian. The form…
Self-consistent model of a solid for the description of lattice and magnetic properties
T. Balcerzak, K. Szałowski, M. Jaščur
In the paper a self-consistent theoretical description of the lattice and magnetic properties of a model system with magnetoelastic interaction is presented. The dependence of magn…
Exact Diagonalization Study of an Extended Hubbard Model for a Cubic Cluster at Quarter Filling
K. Szałowski, T. Balcerzak, M. Jaščur +2
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 b…
Theoretical Study of the Frustrated Ising Antiferromagnet on the Honeycomb Lattice
A. Bobák, T. Lučivjanský, M. Žukovič +2
We study effects of the next-next-nearest-neighbour antiferromagnetic () interaction on critical properties (or phase diagram) of the frustrated spin- $J_1-J_…
Tricritical behaviour of the frustrated Ising antiferromagnet on the honeycomb lattice
A. Bobák, T. Lučivjanský, M. Žukovič +2
We use the effective-field theory with correlations based on different cluster sizes to investigate phase diagrams of the frustrated Ising antiferromagnet on the honeycomb lattice…
Frustration in an exactly solvable mixed-spin Ising model with bilinear and three-site four-spin interactions on a decorated square lattice
M. Jaščur, V. Štubňa, K. Szałowski +1
Competitive effects of so-called three-site four-spin interactions, single ion anisotropy and bilinear interactions is studied in the mixed spin-1/2 and spin-1 Ising model on a dec…