33 citations · 142 across the 8 of their papers we have counts for
8 papers
Computation of microcanonical entropy at fixed magnetization without direct counting
Alessandro Campa, Giacomo Gori, Vahan Hovhannisyan +2
We discuss a method to compute the microcanonical entropy at fixed magnetization without direct counting. Our approach is based on the evaluation of a saddle-point leading to an op…
Ising chains with competing interactions in presence of long-range couplings
Alessandro Campa, Giacomo Gori, Vahan Hovhannisyan +2
In this paper we study an Ising spin chain with short-range competing interactions in presence of long-range ferromagnetic interactions in the canonical ensemble. The simultaneous…
Complete analysis of ensemble inequivalence in the Blume-Emery-Griffiths model
V. V. Hovhannisyan, N. S. Ananikian, A. Campa +1
We study inequivalence of canonical and microcanonical ensembles in the mean-field Blume-Emery-Griffiths model. This generalizes previous results obtained for the Blume-Capel model…
Exactly solvable spin-1 Ising-Heisenberg diamond chain with the second-neighbor interaction between nodal spins
Vahan Hovhannisyan, Jozef Strecka, Nerses Ananikian
The spin-1 Ising-Heisenberg diamond chain with the second-neighbor interaction between the nodal spins is rigorously solved using the transfer-matrix method. Exact results for the…
Entanglement, magnetic and quadrupole moments properties of the mixed spin Ising-Heisenberg diamond chain
V. S. Abgaryan, N. S. Ananikian, L. N. Ananikyan +1
Thermal entanglement, magnetic and quadrupole moments properties of the mixed spin-1/2 and spin-1 Ising-Heisenberg model on a diamond chain are considered. Magnetization and quadru…
Magnetization plateaus of an exactly solvable spin-1 Ising-Heisenberg diamond chain
Nerses Ananikian, Jozef Strecka, Vahan Hovhannisyan
The spin-1 Ising-Heisenberg diamond chain in a magnetic field is exactly solved by a rigorous treatment based on the transfer-matrix method. An exact ground-state phase diagram inc…
Magnetic properties, Lyapunov exponent and superstability of the spin-1/2 Ising-Heisenberg model on diamond chain
N. S. Ananikian, V. V. Hovhannisyan
The exactly solvable spin-1/2 Ising-Heisenberg model on diamond chain has been considered. We have found the exact results for the magnetization by using recursion relation method.…
Kagome Approximation for 3He on Husimi Lattice with Two- and Three-Site Exchange Interactions
N. Ananikian, V. Hovhannisyan, H. Lazaryan
The Ising approximation of the Heisenberg model in a strong magnetic field, with two-, and three-spin exchange interactions are studied on a Husimi lattice. This model can be consi…