Superstructure-dependent electronic states in CaAlSi superconductors studied by angle-resolved photoemission spectroscopy

T. Sato, Y. X. Xiao, S. Souma, K. Nakayama, K. Sugawara, S. Kuroiwa, Jun Akimitsu, T. Takahashi

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We have performed high-resolution angle-resolved photoemission spectroscopy on layered polymorph series of 1H-, 5H-, and 6H-CaAlSi, which exhibit superconductivity below 6.5, 5.7, and 7.7 K, respectively. While the overall band structure in the valence-band region is similar among these compounds, the volume of the Fermi surface at the M point and the magnitude of the superconducting gap are markedly different from each other. Implications of such variation in the electronic structure due to the superstructure along the c axis are discussed in relation to the physical properties of CaAlSi.

Original languageEnglish
Article number195114
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number19
Publication statusPublished - May 11 2015
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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