Hyperfine effects on ESR in metals we suppose that the

Hyperfine effects on ESR in metals we suppose that the electron spin of a conduction electron in a metal sees an effective magnetic field from the hyperfine interaction of the electron spin with the nuclear spin. Let the z component of the field seen, by the conduction electron be written where Izf equally likely to be ± ½. 

(a) Show that (B2t) = (a/2N)3N. 

(b) Show that (B*i = 3(a/2N) 4N2, for N >> 1.


B,

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