Slaters band-theory treatment of Mott-Hubbard insulators

7 Slater s band-theory treatment of Mott-Hubbard insulators 

X This has of course been put in doubt by Anderson s proposal of resonating valence bond states (see Chapter 9). 

One can see in an elementary way that a simple NiO-type antiferromagnetic arrangement cannot be stable in CoO. As in Chapter 3, Section 3, if (x) is the atomic orbital on atom i, we set for the Wannier wave function giving some overlap onto neighbouring atoms 

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