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cond-mat1993
Thermodynamical Properties of the Antiferromagnetic Heisenberg Model in Dimensions d=1,2,3
M. Karbach, K. -H. Mütter, P. Ueberholz +1
The evolution equation for the expectation values of the Boltzmann factor between valence bond states is evaluated in lowest order of the dimer cluster expansion. Explicit formulas…
cond-mat1993
A New Approach to the Spin 1/2 Quantum Heisenberg Model
K. -H. Mütter
An evolution equation for the expectation values of the Boltzmann factor between monomer valence bond states is derived. It contains the whole information on the thermodynamical an…