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Critical analysis of the mean-field approximation for the calculation of the magnetic moment in the Friedel-Anderson impurity model
2006
Physical Review B
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It is shown that the calculation of the magnetic moment of a Friedel-Anderson impurity in mean-field theory is unreliable. A class of approximate solutions, which contains the mean-field solution as an element, is expressed in rotated Hilbert space and optimized. The optimal state has considerably lower energy than the mean field solution and requires almost twice the Coulomb exchange U to become magnetic. Since most moment calculations of magnetic impurities, for example the
doi:10.1103/physrevb.73.092418
fatcat:yax4yd4wsnbuxkikkh5vt3kfr4