Is Heisenberg model or in its simplier form Ising model a good approximation to study magnetic systems?
Is it possible to calculate/estimate the value of the J parameter to be used in the Heisenberg/Ising Hamiltonians?
What measured quantity can be associated to the value of the J parameter in the Heisenberg/Ising hamiltonians?
What are the physical consequences of adding a constant to the diagonal of the effective Hamiltonian of monolayer materials?
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