Intermediate-valence icosahedral Au-Al-Yb quasicrystal

Tetsu Watanuki, Shiro Kashimoto, Daichi Kawana, Teruo Yamazaki, Akihiko MacHida, Yukinori Tanaka, Taku J. Sato

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41 Citations (Scopus)

Abstract

A quasiperiodic intermediate-valence (IV) system is realized in an icosahedral Au-Al-Yb quasicrystal. X-ray absorption spectroscopy near the Yb L 3 edge indicates that quasiperiodically arranged Yb ions assume a mean valence of 2.61, between a divalent state (4f14, J=0) and a trivalent one (4f13, J=7/2). Magnetization measurements demonstrate that the 4f holes in this quasicrystal have a localized character. The magnetic susceptibility shows a Curie-Weiss behavior above ∼100 K with an effective magnetic moment of 3.81μ B per Yb. Moreover, a crystalline approximant to this quasicrystal is an IV compound. We propose a heterogeneous IV model for the quasicrystal, whereas the crystalline approximant is most likely a homogeneous IV system. At temperatures below ∼10 K, specific heat and magnetization measurements reveal non-Fermi-liquid behavior in both the quasicrystal and its crystalline approximant without either doping, pressure, or field tuning.

Original languageEnglish
Article number094201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number9
DOIs
Publication statusPublished - 2012 Sep 10
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Watanuki, T., Kashimoto, S., Kawana, D., Yamazaki, T., MacHida, A., Tanaka, Y., & Sato, T. J. (2012). Intermediate-valence icosahedral Au-Al-Yb quasicrystal. Physical Review B - Condensed Matter and Materials Physics, 86(9), [094201]. https://doi.org/10.1103/PhysRevB.86.094201