Two types of multistack structures in MgB 2-type superconductor CaAlSi

Hajime Sagayama, Yusuke Wakabayashi, Hiroshi Sawa, Takashi Kamiyama, Akinori Hoshikawa, Stefanus Harjo, Kentaro Uozato, Ajay K. Ghosh, Masashi Tokunaga, Tsuyoshi Tamegai

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Crystal structure analysis of an AlB 2-type superconductor, CaAlSi, has been carried out using synchrotron X-rays and neutron diffraction measurements. Two different stackings along the c-axis - 5-fold and 6-fold structures - with different values of T c 6.0 and 8.2 K, respectively, are confirmed. Our results show that Al and Si atoms are ordered alternately in honeycomb layers, and Ca atoms are intercalated at regular intervals between the (Al,Si) layers in both the structures. The 5-fold and 6-fold structures are determined by the arrangement of Al and Si along the c-axis. The relation between T c and the structure is discussed based on our structural analysis.

Original languageEnglish
Article number043713
Journaljournal of the physical society of japan
Volume75
Issue number4
DOIs
Publication statusPublished - 2006 Apr 1
Externally publishedYes

Keywords

  • AlB -type structure
  • CaAlSi
  • Multistack structure
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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