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.
N1 - Funding Information:
We thank K. Behnia, S. Fujimoto, H. Ikeda, H. Kontani, K. Maki, M. Takigawa, C.J. van der Beek, A. I. Buzdin, K. Machida, and M. Sigrist for valuable discussions. This work was partly supported by Grants-in-Aid for Scientific Research from MEXT. Y. K. was supported by the Japan Society for the Promotion of Science for Young Scientists.
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
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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 -