Thermodynamic properties of the 2D frustrated Heisenberg model for the entire $J_1-J_2$ circle

A. V. Mikheyenkov, A. V. Shvartsberg, V. E. Valiulin +1

Using the spherically symmetric self-consistent Green's function method, we consider thermodynamic properties of the $S=1/2$ $J_1$-$J_2$ Heisenberg model on the 2D square lattice.…