Given a system of two distinct lattice sites, each occupied by an atom whose spin (s=1)...
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Given a system of two distinct lattice sites, each occupied by an atom whose spin (s=1) is so oriented that its energy takes one of three values e=1.0,-1 with equal probability. The atoms do not interact with other. The ensemble average values for the energy U of the system, assumed to be that of the spins only, is O O 2 1+e + e-B e- e- 1+ e + e- e + e- 1+e+e- - e-B 1+ e +e= Given a system of two distinct lattice sites, each occupied by an atom whose spin (s=1) is so oriented that its energy takes one of three values e=1.0,-1 with equal probability. The atoms do not interact with other. The ensemble average values for the energy U of the system, assumed to be that of the spins only, is O O 2 1+e + e-B e- e- 1+ e + e- e + e- 1+e+e- - e-B 1+ e +e=
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