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Intermediate-valence quasicrystal of a Cd-Yb alloy under pressure

Kawana, Daichi*; Watanuki, Tetsu; Machida, Akihiko; Shobu, Takahisa  ; Aoki, Katsutoshi; Tsai, A. P.*

A quasiperiodic intermediate-valence system was prepared by applying pressure to an icosahedral Cd-Yb quasicrystal. In this system, each quasiperiodic lattice point has a charge degree of freedom. Yb $$L$$$$_{rm III}$$ X-ray absorption spectroscopy experiments demonstrate that the Yb valence increases continuously upon compression from a divalent state at ambient pressure and reaches 2.33 at 31.7 GPa. A comparison study to the crystalline approximant suggests that the quasiperiodically arranged Yb ions have a homogeneous intermediate valence that takes a valence fluctuation state under pressure.

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Category:Materials Science, Multidisciplinary

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