Valence of praseodymium in superconducting Pr(O,F)BiS2 single crystals

The praseodymium (Pr) valence in superconducting PrO1−xFxBiS2 single crystals was evaluated by X-ray photoelectron spectroscopy. The Pr 3d core level is split into 3d3/2 and 3d5/2 levels. Both PrO1−xFxBiS2 and Pr2S3, which contain only Pr3+, showed 3d spectra at a lower binding energy than Pr6O11, which contains both Pr3+ and Pr4+. Neither PrO1−xFxBiS2 nor Pr2S3 showed the characteristic satellites of Pr4+ in 3d5/2 spectra. The valence fluctuation between the Pr3+ and Pr4+ states was not confirmed, suggesting that Pr3+ is dominant in PrO1−xFxBiS2 single crystals.

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