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 journalArticle

12 Citations (Scopus)

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

Fingerprint

excitation
penetration
deviation
anisotropy
shift
magnetic fields
temperature
energy

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Unconventional behavior of field-induced quasiparticle excitation in Ca(Al 0.5Si 0.5) 2 . / Kuroiwa, Sogo; Takagiwa, Hiroyuki; Yamazawa, Maki; Akimitsu, Jun; Ohishi, Kazuki; Koda, Akihiro; Higemoto, Wataru; Kadono, Ryosuke.

In: Journal of the Physical Society of Japan, Vol. 73, No. 10, 10.2004, p. 2631-2634.

Research output: Contribution to journalArticle

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, vol. 73, no. 10, pp. 2631-2634. https://doi.org/10.1143/JPSJ.73.2631
Kuroiwa, Sogo ; Takagiwa, Hiroyuki ; Yamazawa, Maki ; Akimitsu, Jun ; Ohishi, Kazuki ; Koda, Akihiro ; Higemoto, Wataru ; Kadono, Ryosuke. / Unconventional behavior of field-induced quasiparticle excitation in Ca(Al 0.5Si 0.5) 2 . In: Journal of the Physical Society of Japan. 2004 ; Vol. 73, No. 10. pp. 2631-2634.
@article{e50a9122f1f349aea10b8556414b5170,
title = "Unconventional behavior of field-induced quasiparticle excitation in Ca(Al 0.5Si 0.5) 2",
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.",
keywords = "μSR, Ca(Al Si ), Flux line lattice, Penetration depth, Superconductivity",
author = "Sogo Kuroiwa and Hiroyuki Takagiwa and Maki Yamazawa and Jun Akimitsu and Kazuki Ohishi and Akihiro Koda and Wataru Higemoto and Ryosuke Kadono",
year = "2004",
month = "10",
doi = "10.1143/JPSJ.73.2631",
language = "English",
volume = "73",
pages = "2631--2634",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "10",

}

TY - JOUR

T1 - Unconventional behavior of field-induced quasiparticle excitation in Ca(Al 0.5Si 0.5) 2

AU - Kuroiwa, Sogo

AU - Takagiwa, Hiroyuki

AU - Yamazawa, Maki

AU - Akimitsu, Jun

AU - Ohishi, Kazuki

AU - Koda, Akihiro

AU - Higemoto, Wataru

AU - Kadono, Ryosuke

PY - 2004/10

Y1 - 2004/10

N2 - 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.

AB - 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.

KW - μSR

KW - Ca(Al Si )

KW - Flux line lattice

KW - Penetration depth

KW - Superconductivity

UR - http://www.scopus.com/inward/record.url?scp=20444420515&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=20444420515&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.73.2631

DO - 10.1143/JPSJ.73.2631

M3 - Article

AN - SCOPUS:20444420515

VL - 73

SP - 2631

EP - 2634

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 10

ER -