Correlation between crystal structures of CaAlSi with and without superlattice and superconducting properties

S. Kuroiwa, H. Sagayama, T. Kakiuchi, H. Sawa, Y. Noda, J. Akimitsu

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38 Citations (Scopus)

Abstract

We have succeeded in growing a phase in CaAlSi with Al and Si atoms being distributed regularly in the AlSi layer corresponding to the B2 plane in the AlB2 -type structure without a superlattice along the c axis. The field-induced magnetic response in a phase exhibits an almost isotropic characteristic for the respective crystal axis. Moreover, the 2Δ(0) kB Tc and Δ Cel γN Tc estimated by heat capacity measurements are ∼3.5 and ∼1.4, respectively, indicating a BCS superconductor with a weak coupling. Although CaAlSi has a two-dimensional layered structure, these results strongly suggest that the superconductivity of the phase in CaAlSi is derived from a three-dimensional electronic ground state such as a conventional s -wave superconductor, which is markedly different from those of superstructured CaAlSi.

Original languageEnglish
Article number014517
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number1
DOIs
Publication statusPublished - Aug 3 2006
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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