X-ray-absorption spectroscopy study of the heavy-fermion superconductor PrOs 4 Sb 12
X-ray-absorption spectroscopy study of the heavy-fermion superconductor PrOs 4 Sb 12
复制标题
重费米子超导体PrOs 4 Sb 12 的X射线吸收光谱研究
DOI：
10.1103/physrevb.67.180511
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发表时间：
2003
影响因子：
3.7
通讯作者：
M. Maple
中科院分区：
文献类型：
--
作者：
D. Cao;F. Bridges;S. Bushart;E. Bauer;M. Maple
X-ray-absorption fine-structure (XAFS) measurements have been carried out at the Pr ${L}_{\mathrm{III}}$ and Os ${L}_{\mathrm{III}}$ edges on the Pr-based heavy-fermion superconductor ${\mathrm{PrOs}}_{4}{\mathrm{Sb}}_{12}.$ The x-ray absorption near-edge structure results suggest that the Pr valence is very close to 3+ with at most a small amount of ${\mathrm{Pr}}^{4+}$ $[{v}_{\mathrm{Pr}}\ensuremath{\sim}3.019(3)],$ 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 $({\ensuremath{\Theta}}_{E}\ensuremath{\sim}75\mathrm{K}),$ with a possible very small off-center displacement. They also indicate that the ${\mathrm{Os}}_{4}{\mathrm{Sb}}_{12}$ framework in ${\mathrm{PrOs}}_{4}{\mathrm{Sb}}_{12}$ is quite stiff.
X-ray-absorption fine-structure (XAFS) measurements have been carried out at the Pr ${L}_{\mathrm{III}}$ and Os ${L}_{\mathrm{III}}$ edges on the Pr-based heavy-fermion superconductor ${\mathrm{PrOs}}_{4}{\mathrm{Sb}}_{12}.$ The x-ray absorption near-edge structure results suggest that the Pr valence is very close to 3+ with at most a small amount of ${\mathrm{Pr}}^{4+}$ $[{v}_{\mathrm{Pr}}\ensuremath{\sim}3.019(3)],$ 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 $({\ensuremath{\Theta}}_{E}\ensuremath{\sim}75\mathrm{K}),$ with a possible very small off-center displacement. They also indicate that the ${\mathrm{Os}}_{4}{\mathrm{Sb}}_{12}$ framework in ${\mathrm{PrOs}}_{4}{\mathrm{Sb}}_{12}$ is quite stiff.