Role of the Ce valence in the coexistence of superconductivity and ferromagnetism of CeO1−xFxBiS2 revealed by Ce L3-edge x-ray absorption spectroscopy
T. Sugimoto, B. Joseph, E. Paris, A. Iadecola, T. Mizokawa, S. Demura, Y. Mizuguchi, Y. Takano, N. L. Saini
DOI 10.1103/PhysRevB.89.201117 · Physical Review B
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Abstract
We have performed Ce L3-edge x-ray absorption spectroscopy (XAS) measurements on CeO1−xFxBiS2, in which the superconductivity of the BiS2 layer and the ferromagnetism of the CeO1−xFx layer are induced by the F doping, in order to investigate the impact of the F doping on the local electronic and lattice structures. The Ce L3-edge XAS spectrum of CeOBiS2 exhibits coexistence of 4f1 (Ce3+) and 4f0 (Ce4+) state transitions revealing Ce mixed valency in this system. The spectral weight of the 4f0 state decreases with the F doping and completely disappears for x>0.4 where the system shows the superconductivity and the ferromagnetism. The results suggest that suppression of the Ce-S-Bi coupling channel by the F doping appears to drive the system from the valence fluctuation regime to the Kondo-like regime, leading to the coexistence of the superconducting BiS2 layer and the ferromagnetic CeO1−xFx layer.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.5 | Pressure not reported | unknown |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.1 | 1.5 GPa | unknown |
| CeO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
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