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Pressure-induced formation of intermediate-valence quasicrystalline system in a Cd-Mg-Yb alloy

Watanuki, Tetsu; Kawana, Daichi*; Machida, Akihiko; Tsai, A. P.*

A quasiperiodic intermediate-valence system was prepared by applying pressure to an icosahedral Cd-Mg-Yb quasicrystal. X-ray absorption spectroscopy near the Yb $$L$$$$_{3}$$-edge demonstrates that the Yb valence increases continuously upon compression from the divalent state (4$$f$$$$^{14}$$) at ambient pressure and reaches a value of 2.71 at 57.6 GPa, which is close to the trivalent state (4$$f$$$$^{13}$$). By following the trend of Yb-based intermediate-valence crystalline compounds, this large valence increase suggests the change of 4$$f$$ character in the Cd-Mg-Yb quasicrystal from an itinerant state with weak electron correlations to an intermediate region between an itinerant and a localized state with strong correlations.

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Category:Materials Science, Multidisciplinary

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