Effect of Pressure on Valence and Structural Properties of YbFe ₂ Ge ₂ Heavy Fermion Compound—A Combined Inelastic X-ray Spectroscopy, X-ray Diffraction, and Theoretical Investigation

Journal Article · Mon Oct 19 00:00:00 EDT 2015 · Inorganic Chemistry

DOI:https://doi.org/10.1021/acs.inorgchem.5b01534· OSTI ID:1332340

Kumar, Ravhi S. ^[1]; Svane, Axel ^[2]; Vaitheeswaran, Ganapathy ^[3]; Kanchana, Venkatakrishnan ^[4]; Antonio, Daniel ^[5]; Cornelius, Andrew L. ^[5]; Bauer, Eric D. ^[6]; Xiao, Yuming ^[7]; Chow, Paul ^[7]

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1. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and Astronomy and HiPSEC; UNLV
2. Aarhus Univ. (Denmark). Dept. of Physics and Astronomy
3. Univ. of Hyderabad, Telengana (India). Inst. of Technology Hyderabad
4. Indian Inst. of Technology Hyderabad, Telengana (India)
5. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and Astronomy and HiPSEC
6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
7. Argonne National Lab. (ANL), Argonne, IL (United States). Carnegie Inst. of Washington and Advance Photon Source

We measured the crystal structure and the Yb valence of the YbFe₂Ge₂ heavy fermion compound 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. Moreover, 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. Finally, 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.

• Research Organization: Univ. of Nevada, Las Vegas, NV (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: AC02-06CH11357; FG02-99ER45775; NA0001974; NA0001982; SC0001928
• OSTI ID: 1332340
• Alternate ID(s): OSTI ID: 1227024
• Journal Information: Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 21 Vol. 54; ISSN 0020-1669
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY