Observation of an antiferromagnetic quantum critical point in high-purity LaNiO${}_3$

Abstract

Amongst the rare-earth perovskite nickelates, LaNiO${}_3$ (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.

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• $f$-electron and magnetic ordering effects in nickelates LaNiO${}_2$ and NdNiO${}_2$: remarkable role of the cuprate-like $3d_{x^2-y^2}$ band
• Charge and spin instabilities in superconducting La${}_3$Ni${}_2$O${}_7$
• Synthesis and electronic properties of Nd${}_{n+1}$Ni${}_n$O${}_{3n+1}$ Ruddlesden-Popper nickelate thin films
• Advances in Complex Oxide Quantum Materials Through New Approaches to Molecular Beam Epitaxy
• Optical properties of LaNiO3 films tuned from compressive to tensile strain
• PERSPECTIVE: Emergent phases in rare earth nickelate heterostructures
• Excitonic Metal and Non-Fermi Liquid Behaviour in Twisted Double Bilayer Graphene near Charge Neutrality
• Infinite critical boson non-Fermi liquid on heterostructure interfaces
• Quantum science with arrays of metastable helium-3 atoms
• Emergence of interfacial magnetism in strongly-correlated nickelate-titanate superlattices