Linear-in-temperature resistivity for optimally superconducting (Nd,Sr)NiO2

Kyuho Lee (), Bai Yang Wang, Motoki Osada, Berit H. Goodge, Tiffany C. Wang, Yonghun Lee, Shannon Harvey, Woo Jin Kim, Yijun Yu, Chaitanya Murthy, Srinivas Raghu, Lena F. Kourkoutis and Harold Y. Hwang
Additional contact information
Kyuho Lee: SLAC National Accelerator Laboratory
Bai Yang Wang: SLAC National Accelerator Laboratory
Motoki Osada: SLAC National Accelerator Laboratory
Berit H. Goodge: Cornell University
Tiffany C. Wang: SLAC National Accelerator Laboratory
Yonghun Lee: SLAC National Accelerator Laboratory
Shannon Harvey: SLAC National Accelerator Laboratory
Woo Jin Kim: SLAC National Accelerator Laboratory
Yijun Yu: SLAC National Accelerator Laboratory
Chaitanya Murthy: Stanford University
Srinivas Raghu: SLAC National Accelerator Laboratory
Lena F. Kourkoutis: Cornell University
Harold Y. Hwang: SLAC National Accelerator Laboratory

Nature, 2023, vol. 619, issue 7969, 288-292

Abstract: Abstract The occurrence of superconductivity in proximity to various strongly correlated phases of matter has drawn extensive focus on their normal state properties, to develop an understanding of the state from which superconductivity emerges1–4. The recent finding of superconductivity in layered nickelates raises similar interests5–8. However, transport measurements of doped infinite-layer nickelate thin films have been hampered by materials limitations of these metastable compounds: in particular, a high density of extended defects9–11. Here, by moving to a substrate (LaAlO3)0.3(Sr2TaAlO6)0.7 that better stabilizes the growth and reduction conditions, we can synthesize the doping series of Nd1–xSrxNiO2 essentially free from extended defects. In their absence, the normal state resistivity shows a low-temperature upturn in the underdoped regime, linear behaviour near optimal doping and quadratic temperature dependence for overdoping. This is phenomenologically similar to the copper oxides2,12 despite key distinctions—namely, the absence of an insulating parent compound5,6,9,10, multiband electronic structure13,14 and a Mott–Hubbard orbital alignment rather than the charge-transfer insulator of the copper oxides15,16. We further observe an enhancement of superconductivity, both in terms of transition temperature and range of doping. These results indicate a convergence in the electronic properties of both superconducting families as the scale of disorder in the nickelates is reduced.

Date: 2023
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DOI: 10.1038/s41586-023-06129-x

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