Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session L47: Kitaev Magnetism: Experiment
8:00 AM–11:00 AM,
Wednesday, March 4, 2020
Room: 710/712
Sponsoring
Units:
GMAG DMP
Chair: Kemp Plumb, Brown University
Abstract: L47.00009 : A rare-earth Kitaev material candidate YbCl3*
Presenter:
Eve Emmanouilidou
(Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA)
Authors:
Eve Emmanouilidou
(Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA)
Jie Xing
(Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA)
Huibo Cao
(Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA)
Chaowei Hu
(Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA)
Jinyu Liu
(Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA)
David E Graf
(National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA)
Arthur Ramirez
(Department of Physics, University of California, Santa Cruz, CA 95064, USA)
Gang Chen
(State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China)
Ni Ni
(Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA)
Most of the searches for Kitaev materials deal with 4d/5d magnets with spin-orbit-coupled J = ½ local moments such as iridates and α-RuCl3. Here we propose a new Kitaev material candidate YbCl3. We perform thermodynamic, ac susceptibility and angle-dependent torque measurements on a YbCl3 single crystal. We find that the Yb3+ ion exhibits a Kramers doublet ground state that gives rise to an effective spin Jeff = ½ local moment with likely strong anisotropic exchange interactions. The compound exhibits short-range magnetic ordering at around 1.20 K followed by long-range ordering at 0.60 K. These orderings can be suppressed by in-plane and out-of-plane magnetic fields, resulting in a quantum critical point at around 6 and 10 T, respectively. Furthermore, the non-monotonic decrease of Neel temperature under out-of-plane magnetic fields and the 99.8% of ground state entropy release across the short-range ordering, strongly suggest that YbCl3 is a close realization of a Kitaev system.
**Work at UCLA was supported by NSF DMREF-1629457. Work at UCSC was supported by DOE DE-SC0017862. Work at NHMFL is supported by NSF/DMR-1644779 and the State of Florida. G. C. acknowledges MOST Grant 2016YFA0301001 and 2016YFA0300500. H. C. acknowledges US DOE BES Early Career Award KC0402010.
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