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

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Abstract

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
Volume73
Issue number10
DOIs
Publication statusPublished - Oct 2004
Externally publishedYes

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Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kuroiwa, S., Takagiwa, H., Yamazawa, M., Akimitsu, J., Ohishi, K., Koda, A., Higemoto, W., & Kadono, R. (2004). Unconventional behavior of field-induced quasiparticle excitation in Ca(Al 0.5Si 0.5) 2 . Journal of the Physical Society of Japan, 73(10), 2631-2634. https://doi.org/10.1143/JPSJ.73.2631