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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.

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.

Authors :
Kumar RS
Svane A
Vaitheeswaran G
Kanchana V
Antonio D
Cornelius AL
Bauer ED
Xiao Y
Chow P
Source :
Inorganic chemistry [Inorg Chem] 2015 Nov 02; Vol. 54 (21), pp. 10250-5. Date of Electronic Publication: 2015 Oct 19.
Publication Year :
2015

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.

Details

Language :
English
ISSN :
1520-510X
Volume :
54
Issue :
21
Database :
MEDLINE
Journal :
Inorganic chemistry
Publication Type :
Academic Journal
Accession number :
26479903
Full Text :
https://doi.org/10.1021/acs.inorgchem.5b01534