Transport phase diagram and anomalous metallicity in superconducting infinite-layer nickelates

Yu-Te Hsu (), Kyuho Lee, Sven Badoux, Caitlin Duffy, Alessandro Cuoghi, Bai Yang Wang, Arwin Kool, Isaac Haïk-Dunn, Harold Y. Hwang and Nigel E. Hussey ()
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Yu-Te Hsu: Radboud University
Kyuho Lee: Stanford University
Sven Badoux: Radboud University
Caitlin Duffy: Radboud University
Alessandro Cuoghi: Radboud University
Bai Yang Wang: Stanford University
Arwin Kool: Radboud University
Isaac Haïk-Dunn: Laboratoire National des Champs Magnétiques Intenses (CNRS, EMFL, INSA, UGA, UPS)
Harold Y. Hwang: SLAC National Accelerator Laboratory
Nigel E. Hussey: Radboud University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Despite obvious similarities in their electronic and crystallographic structures, it remains unclear whether the interactions that shape the normal and superconducting (SC) state properties of high-Tc cuprates and infinite-layer nickelates (ILNs) have the same origin. This question has been brought into sharper focus with recent studies on ILNs of improved crystallinity that reveal a SC dome of comparable extent and similar transport properties above Tc as the hole-doped cuprates. The evolution of these properties in the magnetic-field-induced normal state, however, has yet to be determined. Here, we examine the magnetotransport properties of new-generation Nd1−xSrxNiO2 films in the T → 0 limit across the phase diagram in fields up to 54 T. This extensive study reveals that the limiting low-T form of the normal-state resistivity in ILNs exhibits non-Fermi-liquid behaviour over an extended doping range inside the SC dome, rather than at a singular quantum critical point. While there are clear differences in the charge dynamics of ILNs and cuprates, most notably in the magnetoresistance, our findings reveal that both systems exhibit anomalous metallicity characteristic of a quantum critical phase.

Date: 2024
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DOI: 10.1038/s41467-024-54135-y

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