Superconductivity in Mg2IR3Si: A fully ordered laves phase

Kazutaka Kudo, Hikaru Hiiragi, Toshiaki Honda, Kazunori Fujimura, Hiroyuki Idei, Minoru Nohara

Research output: Contribution to journalArticle

Abstract

Novel ternary Laves phase compounds were explored, and Mg2Ir3Si was synthesized via a solid-state reaction. X-ray diffraction studies revealed that Mg2Ir3Si crystallizes in a Mg2Cu3Si-type structure (P63=mmc, D6h 4, No. 194), which corresponds to a fully ordered variant of hexagonal Laves phase MgZn2. The structure is composed of a hexagonal diamond network of Mg atoms, a breathing Kagome network of Ir atoms, and a triangular network of Si atoms. Electrical resistivity, magnetization, and specific heat measurements of Mg2Ir3Si revealed that it exhibits superconductivity with a transition temperature of 7 K. This compound is compared to another Laves phase compound, Li2IrSi3, in which the positions of Ir and Si are interchanged; Li2IrSi3 has a superconducting transition temperature of 3.8 K. The results obtained demonstrate that both Ir and Si Kagome networks can occur in fully ordered Laves phase compounds, i.e., in Mg2Ir3Si and Li2IrSi3, and the former is preferable for superconductivity.

Original languageEnglish
Article number013701
JournalJournal of the Physical Society of Japan
Volume89
Issue number1
DOIs
Publication statusPublished - Jan 1 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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