Insulator-to-metal crossover near the edge of the superconducting dome in Nd1−xSrxNiO2

Yu-Te Hsu; Bai Yang Wang; Maarten Berben; Danfeng Li; Kyuho Lee; Caitlin Duffy; Thom Ottenbros; Woo Jin Kim; Motoki Osada; Steffen Wiedmann; Harold Y. Hwang; Nigel E. Hussey

doi:10.1103/PhysRevResearch.3.L042015

Insulator-to-metal crossover near the edge of the superconducting dome in Nd1−xSrxNiO2

Yu-Te Hsu, Bai Yang Wang, Maarten Berben, Danfeng Li, Kyuho Lee, Caitlin Duffy, Thom Ottenbros, Woo Jin Kim, Motoki Osada, Steffen Wiedmann, Harold Y. Hwang, Nigel E. Hussey

DOI 10.1103/PhysRevResearch.3.L042015 · Physical Review Research

T1

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Abstract

We report a systematic magnetotransport study of superconducting infinite-layer nickelate thin films Nd1−xSrxNiO2 with 0.15≤x≤0.225. By suppressing superconductivity with out-of-plane magnetic fields up to 37.5 T, we find that the normal state resistivity of Nd1−xSrxNiO2 is characterized by a crossover from a metallic T2 behavior to an insulating log(1/T) behavior for all x except x=0.225, at which the resistivity is predominantly metallic. The log(1/T) behavior is found to be robust against magnetic fields, inconsistent with scenarios involving localization or Kondo scattering, and points to an anomalous insulating state possibly driven by strong correlations. In the metallic state, we find no evidence for non-Fermi-liquid behavior arising from proximity to a putative quantum critical point located inside the superconducting dome.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nd1-xSrxNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure not reported	midpoint
Nd0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown