Local Structure Analysis of Heavy Fermion Ce2Pt6Ga15 with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure

Yuji Matsumoto*, Yuki Watabe, Fabio Iesari, Masakatsu Osumi, Kyugo Ota, Yoshinori Haga, Keisuke Hatada, Toshihiro Okajima

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

抄録

Ce2Pt6Ga15 is a heavy fermion compound near the quantum critical point (QCP). Its crystal structure may exhibit magnetic frustration due to a honeycomb arrangement; however, stacking faults in the crystal hinder structural analysis. As a local structure probe, extended X-ray absorption fine structure (EXAFS) is less sensitive to stacking faults and is a powerful tool for crystal structure determination. We synthesized single-crystal Ce2Pt6Ga15, performed single-crystal and powder X-ray diffraction experiments, and conducted X-ray absorption spectroscopy (XAS) measurements. The composition of Ce2Pt6Ga15 deviates from stoichiometry, suggesting Ce and Ga enrichment or Pt site deficiencies. A comparison of X-ray absorption near-edge structure (XANES) at the Ce L3-edge with reference materials suggests that Ce valence is likely trivalent. To determine the exact structure, we simultaneously analyzed EXAFS spectra at the Ce L3-, Pt L3-, and Ga K-edges. The EXAFS spectra of Ce2Pt6Ga15 are inconsistent with the hexagonal Sc0.6Fe2Si4.9-type structure but are better explained by an orthorhombic structure with a honeycomb arrangement.

本文言語英語
論文番号436
ジャーナルMetals
15
4
DOI
出版ステータス出版済み - 2025/04

ASJC Scopus 主題領域

  • 材料科学一般
  • 金属および合金

フィンガープリント

「Local Structure Analysis of Heavy Fermion Ce2Pt6Ga15 with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル