Unconventional Behavior of Field-induced Quasiparticle Excitation in Ca(Al0.5Si0.5)2

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

doi:10.1143/jpsj.73.2631

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

著者情報

キーワード: Ca(Al_0.5Si_0.5)₂, superconductivity, penetration depth, flux line lattice, μSR

ジャーナル認証あり

2004 年 73 巻 10 号 p. 2631-2634

DOI https://doi.org/10.1143/jpsj.73.2631

詳細

抄録

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 2.0 K 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\\simeq2 K, originating either from the anisotropy or two-gap structure.

責任著者(Corresponding author)

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