Effect of Pressure on Valence and Structural Properties of YbFe2Ge2 Heavy Fermion Compound鈥擜 Combined Inelastic X-ray Spectroscopy, X-ray Diffraction, and Theoretical Investigation

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• 作者：Ravhi S. Kumar ; Axel Svane ; Ganapathy Vaitheeswaran ; Venkatakrishnan Kanchana ; Daniel Antonio ; Andrew L. Cornelius ; Eric D. Bauer ; Yuming Xiao ; Paul Chow
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：November 2, 2015
• 年：2015
• 卷：54
• 期：21
• 页码：10250-10255
• 全文大小：371K
• ISSN：1520-510X

文摘

The crystal structure and the Yb valence of the YbFe₂Ge₂ heavy fermion compound was measured at room temperature and under high pressures using high-pressure powder X-ray diffraction and X-ray absorption spectroscopy via both partial fluorescence yield and resonant inelastic X-ray emission techniques. The measurements are complemented by first-principles density functional theoretical calculations using the self-interaction corrected local spin density approximation investigating in particular the magnetic structure and the Yb valence. While the ThCr₂Si₂-type tetragonal (I4/mmm) structure is stable up to 53 GPa, the X-ray emission results show an increase of the Yb valence from v = 2.72(2) at ambient pressure to v = 2.93(3) at 鈭? GPa, where at low temperature a pressure-induced quantum critical state was reported.