Composition Effect of Kondo Behavior in Au–Al–Ce Quasicrystalline Approximants

• Muro Yuji

  Center for Liberal Arts and Sciences, Faculty of Engineering, Toyama Prefectural University

• Fukuhara Tadashi

  Center for Liberal Arts and Sciences, Faculty of Engineering, Toyama Prefectural University

• Namiki Takahiro

  Graduate School of Science and Engineering, University of Toyama

• Kuwai Tomohiko

  Graduate School of Science and Engineering, University of Toyama

• Sakurai Akira

  Department of Materials Science and Technology, Tokyo University of Science

• Ishikawa Asuka

  Department of Materials Science and Technology, Tokyo University of Science

• Suzuki Shintaro

  Department of Materials Science and Technology, Tokyo University of Science

• Tamura Ryuji

  Department of Materials Science and Technology, Tokyo University of Science

Abstract

We have studied the magnetic and transport properties of Tsai-type quasicrystalline approximants, Au_xAl_84−xCe₁₆ and Au_yAl_86−yCe₁₄ by the measurements of magnetic susceptibility χ, specific heat C_p and electrical resistivity ρ. A Curie-Weiss behavior in χ for all compounds indicates the stable trivalent state of Ce ions in Au–Al–Ce. The effective magnetic moment increases with increasing the Au concentration whereas the Weiss temperature decreases. These behaviors suggest the Kondo effect in Au–Al–Ce suppresses with the increase of Au concentration. In C_p, all measured compounds show a broad peak due to the Kondo resonance at 0.8 K. In addition, C_p/T shows a peak below 0.6 K, which implies the existence of spin-glass transition. In all compounds, a pronounced −log T behavior due to Kondo effect are observed in ρ(T) below 10 K. Moreover, Au_yAl_86−yCe₁₄ approximants are the first example displaying a precursor of coherent Kondo state at low temperatures because a broad maximum is observed in ρ(T) at 1.3 K.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 62 (3), 321-324, 2021-03-01

  The Japan Institute of Metals and Materials

Keywords

• Au–Al–Ce
• quasicrystal approximants
• magnetic susceptibility
• specific heat
• electrical resistivity
• Kondo effect
• spin-glass
• coherent Kondo state

Details

• CRID: 1390005822570081152
• NII Article ID: 130007990825
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.mt-mb2020008
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 031303441
• Web Site: http://id.ndl.go.jp/bib/031303441
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I031303441
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/62/3/62_MT-MB2020008/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed