Effect of Pressure on Valence and Structural Properties of YbFe2Ge2 Heavy Fermion Compound-A Combined Inelastic X-ray Spectroscopy, X-ray Diffraction, and Theoretical Investigation
Document Type
Article
Publication Date
10-9-2015
Publication Title
Inorganic Chemistry
Volume
54
Issue
21
First page number:
10250
Last page number:
10255
Abstract
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 ∼9 GPa, where at low temperature a pressure-induced quantum critical state was reported.
Disciplines
Astrophysics and Astronomy
Repository Citation
Kumar, R. S.,
Svane, A.,
Vaitheeswaran, G.,
Kanchana, V.,
Antonio, D.,
Cornelius, A. L.,
Bauer, E. D.,
Xiao, Y.,
Chow, P.
(2015).
Effect of Pressure on Valence and Structural Properties of YbFe2Ge2 Heavy Fermion Compound-A Combined Inelastic X-ray Spectroscopy, X-ray Diffraction, and Theoretical Investigation.
Inorganic Chemistry, 54(21),
10250-10255.
http://dx.doi.org/10.1021/acs.inorgchem.5b01534