title: 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.
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.
authors.affiliation: Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas , Las Vegas, Nevada 89154, United States.
authors.forename: Ravhi S
authors.initials: RS
authors.lastname: Kumar
authors.affiliation: Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark.
authors.forename: Axel
authors.initials: A
authors.lastname: Svane
authors.affiliation: Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad , Gachibowli, Hyderabad - 500 046, Telengana, India.
authors.forename: Ganapathy
authors.initials: G
authors.lastname: Vaitheeswaran
authors.affiliation: Department of Physics, Indian Institute of Technology Hyderabad , Ordnance Factory Estate, Yeddumailaram - 502 205, Telengana, India.
authors.forename: Venkatakrishnan
authors.initials: V
authors.lastname: Kanchana
authors.affiliation: Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas , Las Vegas, Nevada 89154, United States.
authors.forename: Daniel
authors.initials: D
authors.lastname: Antonio
authors.affiliation: Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas , Las Vegas, Nevada 89154, United States.
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Cornelius
authors.affiliation: Los Alamos National Laboratory , P.O. Box 1663, MS K764, Los Alamos, New Mexico 87545, United States.
authors.forename: Eric D
authors.initials: ED
authors.lastname: Bauer
authors.affiliation: HPCAT, Carnegie Institution of Washington and Advance Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Yuming
authors.initials: Y
authors.lastname: Xiao
authors.affiliation: HPCAT, Carnegie Institution of Washington and Advance Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Paul
authors.initials: P
authors.lastname: Chow