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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Liu C,Humbert VFC,Bretz-Sullivan TM,Wang G,Hong D,Wrobel F,Zhang J,Hoffman JD,Pearson JE,Jiang JS,Chang C,Suslov A,Mason N,Norman MR,Bhattacharya A

doi

10.1038/s41467-020-15143-w

subject

Has Abstract

pub_date

2020-03-16 00:00:00

pages

1402

issue

1

issn

2041-1723

pii

10.1038/s41467-020-15143-w

journal_volume

11

pub_type

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