Abstract
To elucidate the superconducting gap structure and the influence of rattling motion on quasiparticle dynamics in the superconducting state of KOs2 O6, thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity at the lowest temperature and the temperature dependence of penetration depth strongly indicate a fully gapped superconductivity in KOs2 O6. The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron-electron inelastic scattering in the normal state. These results highlight that KOs2 O6 is unique among superconductors, which is characterized by the coexistence of fully gapped superconductivity and strong electron correlations.
| Original language | English |
|---|---|
| Pages (from-to) | 3228-3231 |
| Number of pages | 4 |
| Journal | Journal of Physics and Chemistry of Solids |
| Volume | 69 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Dec 2008 |
| Externally published | Yes |
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Keywords
- A. Oxides
- A. Superconductors
- D. Electrical conductivity
- D. Superconductivity
- D. Thermal conductivity
ASJC Scopus subject areas
- Condensed Matter Physics
- Chemistry(all)
- Materials Science(all)
Cite this
Fully gapped superconductivity and strong electron correlations in the β-pyrochlore KOs2 O6. / Kasahara, Y.; Shimono, Y.; Kato, T.; Hashimoto, K.; Shibauchi, T.; Matsuda, Y.; Yonezawa, S.; Muraoka, Y.; Yamaura, J.; Nagao, Y.; Hiroi, Z.
In: Journal of Physics and Chemistry of Solids, Vol. 69, No. 12, 12.2008, p. 3228-3231.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fully gapped superconductivity and strong electron correlations in the β-pyrochlore KOs2 O6
AU - Kasahara, Y.
AU - Shimono, Y.
AU - Kato, T.
AU - Hashimoto, K.
AU - Shibauchi, T.
AU - Matsuda, Y.
AU - Yonezawa, S.
AU - Muraoka, Y.
AU - Yamaura, J.
AU - Nagao, Y.
AU - Hiroi, Z.
PY - 2008/12
Y1 - 2008/12
N2 - To elucidate the superconducting gap structure and the influence of rattling motion on quasiparticle dynamics in the superconducting state of KOs2 O6, thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity at the lowest temperature and the temperature dependence of penetration depth strongly indicate a fully gapped superconductivity in KOs2 O6. The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron-electron inelastic scattering in the normal state. These results highlight that KOs2 O6 is unique among superconductors, which is characterized by the coexistence of fully gapped superconductivity and strong electron correlations.
AB - To elucidate the superconducting gap structure and the influence of rattling motion on quasiparticle dynamics in the superconducting state of KOs2 O6, thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity at the lowest temperature and the temperature dependence of penetration depth strongly indicate a fully gapped superconductivity in KOs2 O6. The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron-electron inelastic scattering in the normal state. These results highlight that KOs2 O6 is unique among superconductors, which is characterized by the coexistence of fully gapped superconductivity and strong electron correlations.
KW - A. Oxides
KW - A. Superconductors
KW - D. Electrical conductivity
KW - D. Superconductivity
KW - D. Thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=57049150191&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=57049150191&partnerID=8YFLogxK
U2 - 10.1016/j.jpcs.2008.06.058
DO - 10.1016/j.jpcs.2008.06.058
M3 - Article
AN - SCOPUS:57049150191
VL - 69
SP - 3228
EP - 3231
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 12
ER -