Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.086403
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Funding
- Japan Society for the Promotion of Science
- HPSTAR
- EFree, an Energy Frontier Research Center - U.S. Department of Energy Office of Science, Office of Basic Energy Sciences [DE-SC0001057]
- Grants-in-Aid for Scientific Research [26400322] Funding Source: KAKEN
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Pressure dependence of the Ce valence in CeCu2Ge2 has been measured up to 24 GPa at 300 K and to 17 GPa at 18-20Kusing x-ray absorption spectroscopy in the partial fluorescence yield. Asmooth 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)(2)Si-2 at 20 K. Avery weak, monotonic increase of the valence with x was observed, without any significant change in the two SC regions. Within experimental uncertainties, our results showno 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.
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