Figure 5
F(x) function predicted by the Ruderman–Kittel–Kasuya–Yosida (RKKY) model, where x = 2kFr (see main text for details). The open symbols indicate the Er—Er interatomic distances in Er3Cu4Sn4, calculated using the refined data from Table 1. The Fermi vector kF is estimated following the free electron Fermi gas model (Kittel, 1996). |