Electron counts, structural stability, and magnetism in BaCuSn2-CeNi1-xSi2-type YTxGe2 (T= Cr, Mn, Fe, Co, and Ni)

Léa Gustin, Lingyi Xing, Max T. Pan, Rongying Jin, Weiwei Xie

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Results of crystallographic refinement, the relationship between electron counts and structural stability, and magnetic characterization of YTxGe2 (T = Cr, Mn, Fe, Co, and Ni) prepared using the arc melting method are presented. These YTxGe2 compounds crystallize in the BaCuSn2-CeNi1-xSi2-type structure with space group Cmcm, and the site occupancies of 3d transition metals range from x = 0.22 (1) for Cr to x = 0.66 (1) for Ni. Based on a combination of single crystal and powder X-ray diffraction and scanning electron microscopy, the trends are clearly established that the smaller transition metal atoms exhibit larger occupancies on T (Cu) site. Our investigation into the relationship between electron count and site defect reveals that a stable configuration is obtained when reaching 10.3e- per transition metal (Y + T), which strongly correlates with the defect observed in the case of T metals. Magnetic properties measurements indicate paramagnetism for T = Cr, Fe, and Co, but ferromagnetism for T = Mn with a Curie temperature of ∼293 K and effective moment ∼3.6 μB/Mn. The absence of superconductivity in this series is surprising because they consist of similar building blocks and electron counts to superconducting YGe1.5+δ except for 3d transition metals. Introducing 3d transition metals into the system plays a critical role in suppressing superconductivity, offering new insights into the interplay between superconductivity and magnetism in layered intermetallics.

Original languageEnglish (US)
Pages (from-to)840-846
Number of pages7
JournalJournal of Alloys and Compounds
Volume741
DOIs
StatePublished - Apr 15 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Keywords

  • BaCuSn-type
  • CeNiSi-type
  • Ferromagnetism
  • Layered intermetallics
  • Superconductivity

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