High Temperature Expansion for a Chain Model
نویسندگان
چکیده
We consider an arbitrary translationally invariant chain model, with nearest neighbors interaction and satisfying periodic boundary condition. The approach developed here allows a thermodynamic description of the chain model directly in terms of grand potential per site. This thermodynamic function is derived from an auxiliary function constructed only from open connected sub-chains. To exemplify its application we consider the Heisenberg XXZ model in two limit cases: the fermionized version Ising model (t = 0) and the free fermion case (∆ = 0). In both cases we recover the known expressions of the corresponding thermodynamical potential.
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