Identical superconducting gap on different Fermi surfaces of Ca(Al 0.5Si0.5)2 with the AlB2 structure

S. Tsuda, Takayoshi Yokoya, S. Shin, M. Imai, I. Hase

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Angle-resolved photoemission spectroscopy of Ca(Al0.5Si 0.5)2 (CaAlSi), which is a superconductor (transition temperature is 7.7 K) with the AlB2 structure, revealed that superconducting gaps on two Fermi surfaces (FSs) with three-dimensional character around Γ(A) and M(L) in the Brillouin zone provide essentially the same superconducting gap value (∼ 1.2 meV±0.2 meV). This is in contrast to the case of MgB2, in which different FSs exhibit different gap values. The reduced gap value 2Δ(0)/kBT c of ∼4.2±0.2 classifies CaAlSi as a moderately strong-coupling superconductor.

Original languageEnglish
Article number100506
Pages (from-to)1005061-1005064
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
Publication statusPublished - Mar 2004
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics

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