Observation of an antiferromagnetic quantum critical point in high-purity LaNiO3

Changjiang Liu, Vincent F. C. Humbert, Terence M. Bretz-Sullivan, Gensheng Wang, Deshun Hong, Friederike Wrobel, Jianjie Zhang, Jason D. Hoffman, John E. Pearson, J. Samuel Jiang, Clarence Chang, Alexey Suslov, Nadya Mason, M. R. Norman and Anand Bhattacharya ()
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Changjiang Liu: Argonne National Laboratory
Vincent F. C. Humbert: University of Illinois at Urbana-Champaign
Terence M. Bretz-Sullivan: Argonne National Laboratory
Gensheng Wang: Argonne National Laboratory
Deshun Hong: Argonne National Laboratory
Friederike Wrobel: Argonne National Laboratory
Jianjie Zhang: Argonne National Laboratory
Jason D. Hoffman: Harvard University
John E. Pearson: Argonne National Laboratory
J. Samuel Jiang: Argonne National Laboratory
Clarence Chang: Argonne National Laboratory
Alexey Suslov: National High Magnetic Field Laboratory
Nadya Mason: University of Illinois at Urbana-Champaign
M. R. Norman: Argonne National Laboratory
Anand Bhattacharya: Argonne National Laboratory

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Amongst the rare-earth perovskite nickelates, LaNiO3 (LNO) is an exception. While the former have insulating and antiferromagnetic ground states, LNO remains metallic and non-magnetic down to the lowest temperatures. It is believed that LNO is a strange metal, on the verge of an antiferromagnetic instability. Our work suggests that LNO is a quantum critical metal, close to an antiferromagnetic quantum critical point (QCP). The QCP behavior in LNO is manifested in epitaxial thin films with unprecedented high purities. We find that the temperature and magnetic field dependences of the resistivity of LNO at low temperatures are consistent with scatterings of charge carriers from weak disorder and quantum fluctuations of an antiferromagnetic nature. Furthermore, we find that the introduction of a small concentration of magnetic impurities qualitatively changes the magnetotransport properties of LNO, resembling that found in some heavy-fermion Kondo lattice systems in the vicinity of an antiferromagnetic QCP.

Date: 2020
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DOI: 10.1038/s41467-020-15143-w

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