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 $_{3}$ -edge demonstrates that the Yb valence increases continuously upon compression from the divalent state (4 $^{14}$ ) at ambient pressure and reaches a value of 2.71 at 57.6 GPa, which is close to the trivalent state (4 $^{13}$ ). By following the trend of Yb-based intermediate-valence crystalline compounds, this large valence increase suggests the change of 4 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.

Language	:	English
Journal	:	Physical Review B
Volume	:	84
Number	:	5
Pages	:	p.054207_1 - 054207_6
Publication Year/Month	:	2011/08
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Paper URL	:	https://doi.org/10.1103/PhysRevB.84.054207
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : AA20110648
JAEA Abstracts No. : 40000059
Paper Submission No. : 9983

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