Role of valence fluctuations in the superconductivity of Ce122 compounds

H. Yamaoka, Y. Ikeda, I. Jarrige, N. Tsujii, Y. Zekko, Y. Yamamoto, J. Mizuki, J. F. Lin, N. Hiraoka, H. Ishii, K. D. Tsuei, Tatsuo Kobayashi, F. Honda, Y. Onuki

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Abstract

Pressure dependence of the Ce valence in CeCu2Ge2 has been measured up to 24 GPa at 300 K and to 17 GPa at 18-20 K using x-ray absorption spectroscopy in the partial fluorescence yield. A smooth increase of the Ce valence with pressure is observed across the two superconducting (SC) regions without any noticeable irregularity. The chemical pressure dependence of the Ce valence was also measured in Ce(Cu1-xNix)2Si2 at 20 K. A very weak, monotonic increase of the valence with x was observed, without any significant change in the two SC regions. Within experimental uncertainties, our results show no evidence for the valence transition with an abrupt change in the valence state near the SC II region, challenging the valence-fluctuation mediated superconductivity model in these compounds at high pressure and low temperature.

Original languageEnglish
Article number086403
JournalPhysical Review Letters
Volume113
Issue number8
DOIs
Publication statusPublished - Aug 20 2014

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superconductivity
valence
pressure dependence
x ray absorption
irregularities
x ray spectroscopy
absorption spectroscopy
fluorescence
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Yamaoka, H., Ikeda, Y., Jarrige, I., Tsujii, N., Zekko, Y., Yamamoto, Y., ... Onuki, Y. (2014). Role of valence fluctuations in the superconductivity of Ce122 compounds. Physical Review Letters, 113(8), [086403]. https://doi.org/10.1103/PhysRevLett.113.086403

Role of valence fluctuations in the superconductivity of Ce122 compounds. / Yamaoka, H.; Ikeda, Y.; Jarrige, I.; Tsujii, N.; Zekko, Y.; Yamamoto, Y.; Mizuki, J.; Lin, J. F.; Hiraoka, N.; Ishii, H.; Tsuei, K. D.; Kobayashi, Tatsuo; Honda, F.; Onuki, Y.

In: Physical Review Letters, Vol. 113, No. 8, 086403, 20.08.2014.

Research output: Contribution to journalArticle

Yamaoka, H, Ikeda, Y, Jarrige, I, Tsujii, N, Zekko, Y, Yamamoto, Y, Mizuki, J, Lin, JF, Hiraoka, N, Ishii, H, Tsuei, KD, Kobayashi, T, Honda, F & Onuki, Y 2014, 'Role of valence fluctuations in the superconductivity of Ce122 compounds', Physical Review Letters, vol. 113, no. 8, 086403. https://doi.org/10.1103/PhysRevLett.113.086403
Yamaoka H, Ikeda Y, Jarrige I, Tsujii N, Zekko Y, Yamamoto Y et al. Role of valence fluctuations in the superconductivity of Ce122 compounds. Physical Review Letters. 2014 Aug 20;113(8). 086403. https://doi.org/10.1103/PhysRevLett.113.086403
Yamaoka, H. ; Ikeda, Y. ; Jarrige, I. ; Tsujii, N. ; Zekko, Y. ; Yamamoto, Y. ; Mizuki, J. ; Lin, J. F. ; Hiraoka, N. ; Ishii, H. ; Tsuei, K. D. ; Kobayashi, Tatsuo ; Honda, F. ; Onuki, Y. / Role of valence fluctuations in the superconductivity of Ce122 compounds. In: Physical Review Letters. 2014 ; Vol. 113, No. 8.
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