Abstract

Yb LIII X-ray absorption edge measurements yielded 2.20+ and 2.50+ for the Yb valence in the Yb-Rh-Sn compounds with phase I and II', respectively. The former is superconducting (Tc ≈ 8 K), and contains only one crystallographic site for Yb, which suggests that this atom is in a valence fluctuation state.

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