Interplay of superconductivity and rattling phenomena in β-pyrochlore KOs2O6 studied by photoemission spectroscopy

T. Shimojima; Y. Shibata; K. Ishizaka; T. Kiss; A. Chainani; T. Yokoya; T. Togashi; X. Y. Wang; C. T. Chen; S. Watanabe; J. Yamaura; S. Yonezawa; Y. Muraoka; Z. Hiroi; T. Saitoh; S. Shin

doi:10.1103/PhysRevLett.99.117003

Interplay of superconductivity and rattling phenomena in β-pyrochlore KOs2O6 studied by photoemission spectroscopy

T. Shimojima, Y. Shibata, K. Ishizaka, T. Kiss, A. Chainani, T. Yokoya, T. Togashi, X. Y. Wang, C. T. Chen, S. Watanabe, J. Yamaura, S. Yonezawa, Y. Muraoka, Z. Hiroi, T. Saitoh, S. Shin

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Abstract

The electronic structure near the Fermi level (EF) of the Β-pyrochlore superconductor KOs2O6 is studied using laser-excited ultrahigh-resolution photoemission spectroscopy. The superconducting gap clearly opens across the superconducting transition (Tc=9.6K), with the strong electron-phonon coupling value of 2Î"(0)/kBTcâ‰¥4.56. A fitting analysis identifies clear anomalies at Tp=7.5K in the temperature dependencies of the superconducting gap size and the quasiparticle relaxation lifetime. These anomalies and the fine spectral structures arising from phonons suggest that the existence of the rattling behavior of K ions significantly affects the superconductivity in KOs2O6.

Original language	English
Article number	117003
Journal	Physical Review Letters
Volume	99
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.99.117003
Publication status	Published - Sep 13 2007

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.99.117003

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Shimojima, T., Shibata, Y., Ishizaka, K., Kiss, T., Chainani, A., Yokoya, T., Togashi, T., Wang, X. Y., Chen, C. T., Watanabe, S., Yamaura, J., Yonezawa, S., Muraoka, Y., Hiroi, Z., Saitoh, T., & Shin, S. (2007). Interplay of superconductivity and rattling phenomena in β-pyrochlore KOs2O6 studied by photoemission spectroscopy. Physical Review Letters, 99(11), [117003]. https://doi.org/10.1103/PhysRevLett.99.117003

Shimojima, T, Shibata, Y, Ishizaka, K, Kiss, T, Chainani, A, Yokoya, T, Togashi, T, Wang, XY, Chen, CT, Watanabe, S, Yamaura, J, Yonezawa, S, Muraoka, Y, Hiroi, Z, Saitoh, T & Shin, S 2007, 'Interplay of superconductivity and rattling phenomena in β-pyrochlore KOs2O6 studied by photoemission spectroscopy', Physical Review Letters, vol. 99, no. 11, 117003. https://doi.org/10.1103/PhysRevLett.99.117003

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title = "Interplay of superconductivity and rattling phenomena in β-pyrochlore KOs2O6 studied by photoemission spectroscopy",

abstract = "The electronic structure near the Fermi level (EF) of the Β-pyrochlore superconductor KOs2O6 is studied using laser-excited ultrahigh-resolution photoemission spectroscopy. The superconducting gap clearly opens across the superconducting transition (Tc=9.6K), with the strong electron-phonon coupling value of 2{\^I}{"}(0)/kBTc{\^a}‰¥4.56. A fitting analysis identifies clear anomalies at Tp=7.5K in the temperature dependencies of the superconducting gap size and the quasiparticle relaxation lifetime. These anomalies and the fine spectral structures arising from phonons suggest that the existence of the rattling behavior of K ions significantly affects the superconductivity in KOs2O6.",

author = "T. Shimojima and Y. Shibata and K. Ishizaka and T. Kiss and A. Chainani and T. Yokoya and T. Togashi and Wang, {X. Y.} and Chen, {C. T.} and S. Watanabe and J. Yamaura and S. Yonezawa and Y. Muraoka and Z. Hiroi and T. Saitoh and S. Shin",

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doi = "10.1103/PhysRevLett.99.117003",

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AU - Shimojima, T.

AU - Shibata, Y.

AU - Ishizaka, K.

AU - Kiss, T.

AU - Chainani, A.

AU - Yokoya, T.

AU - Togashi, T.

AU - Wang, X. Y.

AU - Chen, C. T.

AU - Watanabe, S.

AU - Yamaura, J.

AU - Yonezawa, S.

AU - Muraoka, Y.

AU - Hiroi, Z.

AU - Saitoh, T.

AU - Shin, S.

PY - 2007/9/13

Y1 - 2007/9/13

N2 - The electronic structure near the Fermi level (EF) of the Β-pyrochlore superconductor KOs2O6 is studied using laser-excited ultrahigh-resolution photoemission spectroscopy. The superconducting gap clearly opens across the superconducting transition (Tc=9.6K), with the strong electron-phonon coupling value of 2Î"(0)/kBTcâ‰¥4.56. A fitting analysis identifies clear anomalies at Tp=7.5K in the temperature dependencies of the superconducting gap size and the quasiparticle relaxation lifetime. These anomalies and the fine spectral structures arising from phonons suggest that the existence of the rattling behavior of K ions significantly affects the superconductivity in KOs2O6.

AB - The electronic structure near the Fermi level (EF) of the Β-pyrochlore superconductor KOs2O6 is studied using laser-excited ultrahigh-resolution photoemission spectroscopy. The superconducting gap clearly opens across the superconducting transition (Tc=9.6K), with the strong electron-phonon coupling value of 2Î"(0)/kBTcâ‰¥4.56. A fitting analysis identifies clear anomalies at Tp=7.5K in the temperature dependencies of the superconducting gap size and the quasiparticle relaxation lifetime. These anomalies and the fine spectral structures arising from phonons suggest that the existence of the rattling behavior of K ions significantly affects the superconductivity in KOs2O6.

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Interplay of superconductivity and rattling phenomena in β-pyrochlore KOs2O6 studied by photoemission spectroscopy

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