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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 ). |


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