Mean-field heat capacity of dilute magnetic alloys

Using an asymptotic solution of the M -impurity thermodynamics of a dilute s-d system, the impurity energy and impurity heat capacity ∆C(T ) are derived for dilute magnetic alloys with spin 1/2 and spin 3/2 impurities. The parameters which enter ∆C are adjusted to fit experimental data on impurity heat capacity of CuCr and (La1−xCex) Al2. Agreement is satisfactory for CuCr, at temperatures below 1K, and good for (La1−xCex)Al2. The magnitude of theoretical ∆C(T ) agrees with experiment and does not require scaling as in previous s-d theories. Nonlinear dependence of ∆C(T ) on impurity concentration has been accounted for the first time.