Dynamic susceptibility of the Anderson model: A quantum Monte Carlo study

Using a highly accurate method of analytic continuation, we calculated the dynamic susceptibility and NMR relaxation rate 1/${\mathit{T}}_1$ of magnetic (Anderson or Kondo) impurities over the entire range T≪${\mathit{T}}_{\mathit{K}}$ to T≫${\mathit{T}}_{\mathit{K}}$. We find that the susceptibility and NMR relaxation rate are universal functions when properly scaled and that the NMR relaxation rate is directly proportional to the universal Kondo resistivity.