X-ray-absorption spectroscopy study of the heavy-fermion superconductor PrOs4Sb12
نویسندگان
چکیده
X-ray-absorption fine-structure ~XAFS! measurements have been carried out at the Pr L III and Os L III edges on the Pr-based heavy-fermion superconductor PrOs4Sb12 . The x-ray absorption near-edge structure results suggest that the Pr valence is very close to 31 with at most a small amount of Pr @vPr;3.019(3)# , while Os is close to metallic in this material. The extended XAFS results show that the Pr ions rattle inside the Sb cage characterized by a low Einstein temperature (QE;75 K), with a possible very small off-center displacement. They also indicate that the Os4Sb12 framework in PrOs4Sb12 is quite stiff.
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