Abstract
The effect of a point defect on the electronic density of states in a CuO 2 plane of the La 2-x Sr x CuO 4 compound is calculated by a Green function method applied to a tight-binding itinerant electronic model. Different possible physical cases are discussed with respect to the shift of the atomic energy level of the impurity and to the modification of its effective transfer integral with its nearest neighbors. We show that a non vanishing magnetic moment can exist at the impurity site, even when this one is non magnetic by itself.
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