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

Daichi Kawana; Tetsu Watanuki; Akihiko MacHida; Takahisa Shobu; Katsutoshi Aoki; Ampo Sai

doi:10.1103/PhysRevB.81.220202

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

Daichi Kawana, Tetsu Watanuki, Akihiko MacHida, Takahisa Shobu, Katsutoshi Aoki, Ampo Sai

Center for Exploration of New Inorganic Materials

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

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 LIII 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.

Original language	English
Article number	220202
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.81.220202
Publication status	Published - 2010 Jun 25

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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AU - Kawana, Daichi

AU - Watanuki, Tetsu

AU - MacHida, Akihiko

AU - Shobu, Takahisa

AU - Aoki, Katsutoshi

AU - Sai, Ampo

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AB - 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 LIII 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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