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

Ravhi S. Kumar, University of Nevada, Las Vegas, NevadaFollow
Axel Svane, Aarhus University
Ganapathy Vaitheeswaran, University of Hyderabad
Venkatakrishnan Kanchana, Indian Institute of Technology Hyderabad
Daniel Antonio, University of Nevada, Las VegasFollow
Andrew L. Cornelius, University of Nevada, Las VegasFollow
Eric D. Bauer, Los Alamos National Laboratory
Yuming Xiao, Carnegie Institution of Washington and Advance Photon SourceFollow
Paul Chow, Carnegie Institution of Washington and Advance Photon SourceFollow

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