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)/kBTc≥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 languageEnglish
Article number117003
JournalPhysical Review Letters
Volume99
Issue number11
DOIs
Publication statusPublished - Sep 13 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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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