Fully gapped superconductivity and strong electron correlations in the β-pyrochlore KOs2 O6

Y. Kasahara; Y. Shimono; T. Kato; K. Hashimoto; T. Shibauchi; Y. Matsuda; S. Yonezawa; Y. Muraoka; J. Yamaura; Y. Nagao; Z. Hiroi

doi:10.1016/j.jpcs.2008.06.058

Fully gapped superconductivity and strong electron correlations in the β-pyrochlore KOs₂ O₆

Y. Kasahara, Y. Shimono, T. Kato, K. Hashimoto, T. Shibauchi, Y. Matsuda, S. Yonezawa, Y. Muraoka, J. Yamaura, Y. Nagao, Z. Hiroi

Research output: Contribution to journal › Article › peer-review

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	https://doi.org/10.1016/j.jpcs.2008.06.058
Publication status	Published - Dec 1 2008
Externally published	Yes

Keywords

A. Oxides
A. Superconductors
D. Electrical conductivity
D. Superconductivity
D. Thermal conductivity

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1016/j.jpcs.2008.06.058

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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, 01.12.2008, p. 3228-3231.

Research output: Contribution to journal › Article › peer-review

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title = "Fully gapped superconductivity and strong electron correlations in the β-pyrochlore KOs2 O6",

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.",

keywords = "A. Oxides, A. Superconductors, D. Electrical conductivity, D. Superconductivity, D. Thermal conductivity",

author = "Y. Kasahara and Y. Shimono and T. Kato and K. Hashimoto and T. Shibauchi and Y. Matsuda and S. Yonezawa and Y. Muraoka and J. Yamaura and Y. Nagao and Z. Hiroi",

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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 - 2008/12/1

Y1 - 2008/12/1

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.

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KW - A. Superconductors

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KW - D. Superconductivity

KW - D. Thermal conductivity

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