Author
Listed:
- Kyuho Lee
(SLAC National Accelerator Laboratory
Stanford University)
- Bai Yang Wang
(SLAC National Accelerator Laboratory
Stanford University)
- Motoki Osada
(SLAC National Accelerator Laboratory
Stanford University)
- Berit H. Goodge
(Cornell University
Cornell University)
- Tiffany C. Wang
(SLAC National Accelerator Laboratory
Stanford University)
- Yonghun Lee
(SLAC National Accelerator Laboratory
Stanford University)
- Shannon Harvey
(SLAC National Accelerator Laboratory
Stanford University)
- Woo Jin Kim
(SLAC National Accelerator Laboratory
Stanford University)
- Yijun Yu
(SLAC National Accelerator Laboratory
Stanford University)
- Chaitanya Murthy
(Stanford University)
- Srinivas Raghu
(SLAC National Accelerator Laboratory
Stanford University)
- Lena F. Kourkoutis
(Cornell University
Cornell University)
- Harold Y. Hwang
(SLAC National Accelerator Laboratory
Stanford University)
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.
Suggested Citation
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 & Harold Y, 2023.
"Linear-in-temperature resistivity for optimally superconducting (Nd,Sr)NiO2,"
Nature, Nature, vol. 619(7969), pages 288-292, July.
Handle:
RePEc:nat:nature:v:619:y:2023:i:7969:d:10.1038_s41586-023-06129-x
DOI: 10.1038/s41586-023-06129-x
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