2 papers
cond-mat.stat-mech2025
Derivation of the free energy, entropy and specific heat for planar Ising models: Application to Archimedean lattices and their duals
Laurent Pierre, Bernard Bernu, Laura Messio
The 2d ferromagnetic Ising model was solved by Onsager on the square lattice in 1944, and an explicit expression of the free energy density is presently available for some othe…
cond-mat.str-el2024
High temperature series expansions of S = 1/2 Heisenberg spin models: algorithm to include the magnetic field with optimized complexity
Laurent Pierre, Bernard Bernu, Laura Messio
This work presents an algorithm for calculating high temperature series expansions (HTSE) of Heisenberg spin models with spin in the thermodynamic limit. This algorithm acc…