Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session D05: Poster Session (6:00pm-7:30pm)
6:00 PM,
Thursday, November 8, 2018
Holiday Inn Knoxville Downtown
Room: Atrium
Abstract ID: BAPS.2018.SES.D05.49
Abstract: D05.00049 : Pressure-induced valance change in Ytterbium intermetallic YbCuGa*
Presenter:
Keely Jane Sage
(Department of Mathematics and Physics, King University)
Authors:
Tyler Brett Helton
(Department of Mathematics and Physics, King University)
Keely Jane Sage
(Department of Mathematics and Physics, King University)
Farzana Nasreen
(Department of Physics and Astronomy, University of Nevada)
Daniel Antonio
(Department of Physics and Astronomy, University of Nevada)
Andrew Cornelius
(Department of Physics and Astronomy, University of Nevada)
Corwin H Booth
(Chemical Science Division, Lawrence Berkeley National Laboratory)
Milton Torikachvili
(Department of Physics, San Diego State University)
Yuming Xiao
(High Pressure Collaborative Access Team, Carnegie Institution of Washington, Advanced Photon Source, Argonne National Laboratory)
Karunakar Kothapalli
(Department of Mathematics and Physics, King University)
Ytterbium (Yb) intermetallic systems are known to exhibit intermediate valence (IV) behavior due to the hybridization of two energetically close localized configurations, the non-magnetic Yb2+ (4f14) and the magnetic Yb3+ (4f13), with the conduction electrons. The IV behavior plays a crucial role in the exhibition of anomalous properties of several rare-earth compounds. Pressure and temperature variation can tune the valency of these types of compounds and increase in pressure tends to delocalize these systems and they show tendency to move towards trivalent state Yb3+ (4f13). YbCuGa is one such compound which shows very intriguing electronic properties owing to its IV. Previous experimental work on YbCuGa at ambient pressure showed IV nature of Yb ions. We report on high pressure, 0-14 GPa, x-ray absorption measurements in partial fluorescence yield mode on YbCuGa system at ambient temperature. Increase in pressure delocalizes the system and pushes it from a valency of ~ 2.58 at ambient pressure to ~ 2.9 at 14.0 GPa. Our results indicate that application of pressure pushes the Yb ion to a magnetic state and therefore magnetic interactions can be expected to dominate as the unit cell volume is decreased.
*Funding Agency is DOE
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.SES.D05.49
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