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

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 2008
Externally published	Yes

Fingerprint

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

Kasahara, Y., Shimono, Y., Kato, T., Hashimoto, K., Shibauchi, T., Matsuda, Y., Yonezawa, S., Muraoka, Y., Yamaura, J., Nagao, Y., & Hiroi, Z. (2008). Fully gapped superconductivity and strong electron correlations in the β-pyrochlore KOs2 O6. Journal of Physics and Chemistry of Solids, 69(12), 3228-3231. https://doi.org/10.1016/j.jpcs.2008.06.058

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

@article{53509e43b8794fc0a526d824b37cd224,

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",

year = "2008",

month = dec

doi = "10.1016/j.jpcs.2008.06.058",

language = "English",

volume = "69",

pages = "3228--3231",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

publisher = "Elsevier Limited",

number = "12",

}

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 -

Access to Document

10.1016/j.jpcs.2008.06.058