Full-gap superconductivity with strong electron correlations in the β-pyrochlore KOs2O6

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.physb.2007.10.090

Full-gap superconductivity with strong electron correlations in the β-pyrochlore KOs₂O₆

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 KOs₂O₆, the thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity and temperature dependence of penetration depth demonstrate full-gap superconductivity in KOs₂O₆. The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron inelastic scattering in the normal state. These results highlight that KOs₂O₆ is unique among superconductors with strong electron correlations.

Original language	English
Pages (from-to)	1068-1070
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	403
Issue number	5-9
DOIs	https://doi.org/10.1016/j.physb.2007.10.090
Publication status	Published - Apr 1 2008
Externally published	Yes

Keywords

Microwave surface impedance
Rattling
Thermal conductivity
β-pyrochlore oxide superconductors

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2007.10.090

Cite this

@article{c91a45e22c86444095041bf265660f78,

title = "Full-gap superconductivity with strong electron correlations in the β-pyrochlore KOs2O6",

abstract = "To elucidate the superconducting gap structure and the influence of rattling motion on quasiparticle dynamics in the superconducting state of KOs2O6, the thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity and temperature dependence of penetration depth demonstrate full-gap superconductivity in KOs2O6. The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron inelastic scattering in the normal state. These results highlight that KOs2O6 is unique among superconductors with strong electron correlations.",

keywords = "Microwave surface impedance, Rattling, Thermal conductivity, β-pyrochlore oxide superconductors",

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",

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doi = "10.1016/j.physb.2007.10.090",

language = "English",

volume = "403",

pages = "1068--1070",

journal = "Physica B: Condensed Matter",

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TY - JOUR

T1 - Full-gap superconductivity with strong electron correlations in the β-pyrochlore KOs2O6

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 - 2008/4/1

Y1 - 2008/4/1

N2 - To elucidate the superconducting gap structure and the influence of rattling motion on quasiparticle dynamics in the superconducting state of KOs2O6, the thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity and temperature dependence of penetration depth demonstrate full-gap superconductivity in KOs2O6. The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron inelastic scattering in the normal state. These results highlight that KOs2O6 is unique among superconductors with strong electron correlations.

AB - To elucidate the superconducting gap structure and the influence of rattling motion on quasiparticle dynamics in the superconducting state of KOs2O6, the thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity and temperature dependence of penetration depth demonstrate full-gap superconductivity in KOs2O6. The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron inelastic scattering in the normal state. These results highlight that KOs2O6 is unique among superconductors with strong electron correlations.

KW - Microwave surface impedance

KW - Rattling

KW - Thermal conductivity

KW - β-pyrochlore oxide superconductors

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