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Kumar RS, Svane A, Vaitheeswaran G, et al. 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. Inorg Chem. 2015;54(21):10250-5doi: 10.1021/acs.inorgchem.5b01534.
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), 10250-5. https://doi.org/10.1021/acs.inorgchem.5b01534
Kumar, Ravhi S, et al. "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 vol. 54,21 (2015): 10250-5. doi: https://doi.org/10.1021/acs.inorgchem.5b01534
Kumar RS, Svane A, Vaitheeswaran G, Kanchana V, Antonio D, Cornelius AL, Bauer ED, Xiao Y, Chow P. 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. Inorg Chem. 2015 Nov 02;54(21):10250-5. doi: 10.1021/acs.inorgchem.5b01534. Epub 2015 Oct 19. PMID: 26479903.
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Inorg Chem. 2015 Nov 02;54(21):10250-5. doi: 10.1021/acs.inorgchem.5b01534. Epub 2015 Oct 19.

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

Ravhi S Kumar, Axel Svane, Ganapathy Vaitheeswaran, Venkatakrishnan Kanchana, Daniel Antonio, Andrew L Cornelius, Eric D Bauer, Yuming Xiao, Paul Chow

Affiliations

  1. Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas , Las Vegas, Nevada 89154, United States.
  2. Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark.
  3. Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad , Gachibowli, Hyderabad - 500 046, Telengana, India.
  4. Department of Physics, Indian Institute of Technology Hyderabad , Ordnance Factory Estate, Yeddumailaram - 502 205, Telengana, India.
  5. Los Alamos National Laboratory , P.O. Box 1663, MS K764, Los Alamos, New Mexico 87545, United States.
  6. HPCAT, Carnegie Institution of Washington and Advance Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States.

PMID: 26479903 DOI: 10.1021/acs.inorgchem.5b01534

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.

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