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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 I^{z}_{f} equally likely to be ± ½.

(a) Show that (B^{2}_{t}) = (a/2N)^{3}N.

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

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