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.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2014 5月 30|
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