Unconventional behavior of field-induced quasiparticle excitation in Ca(Al 0.5Si 0.5) 2

Sogo Kuroiwa, Hiroyuki Takagiwa, Maki Yamazawa, Jun Akimitsu, Kazuki Ohishi, Akihiro Koda, Wataru Higemoto, Ryosuke Kadono

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The temperature (T) and magnetic field (H) dependences of the magnetic penetration depth, λ(T, H), in Ca(Al 0.5Si 0.5) 2 exhibits a significant deviation from that expected for conventional BCS superconductors. In particular, it is inferred from the field dependence of λ(H) (∝ H) at 2.0K that the quasiparticle excitation is strongly enhanced by the Doppler shift. This suggests that the superconducting order parameter in Ca(Al 0.5Si 0.5) 2 is characterized by a small energy scale, Δ S/ k B ≃ 2 K, originating either from the anisotropy or two-gap structure.

Original languageEnglish
Pages (from-to)2631-2634
Number of pages4
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - Oct 2004
Externally publishedYes


  • Ca(Al Si )
  • Flux line lattice
  • Penetration depth
  • Superconductivity
  • μSR

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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