Superconductivity in infinite-layer nickelate La1-xCaxNiO2 thin films

Zeng, Shengwei1; Li, Changjian2,3; Chow, Lin Er1; Cao, Yu4; Zhang, Zhaoting1; Tang, Chi Sin5,6; Yin, Xinmao7; Lim, Zhi Shiuh1; Hu, Junxiong1; Yang, Ping2,5; Ariando, Ariando1

2022-02-01

10.1126/sciadv.abl9927

Science Advances   影响因子和分区

2375-2548

We report the observation of superconductivity in infinite-layer Ca-doped LaNiO2 (La1-xCaxNiO2) thin films and construct their phase diagram. Unlike the metal-insulator transition in Nd- and Pr-based nickelates, the undoped and underdoped La1-xCaxNiO2 thin films are entirely insulating from 300 K down to 2 K. A superconducting dome is observed at 0.15 < x < 0.3 with weakly insulating behavior at the overdoped regime. Moreover, the sign of the Hall coefficient R-H changes at low temperature for samples with a higher doping level. However, distinct from the Nd- and Pr-based nickelates, the R-H-sign-change temperature remains at around 35 K as the doping increases, which begs further theoretical and experimental investigation to reveal the role of the 4f orbital to the (multi) band nature of the superconducting nickelates. Our results also emphasize a notable role of lattice correlation on the multiband structures of the infinite-layer nickelates.

SCI ; EI

英语

ESI高被引 ; NI论文

其他

Agency for Science, Technology, and Research (A* STAR) under its Advanced Manufacturing and Engineering (AME) Individual Research Grant (IRG)[A1983c0034] ; Ministry of Education (MOE) of Singapore[T2EP50121-0039] ; Singapore National Research Foundation (NRF) under the Competitive Research Programs (CRP)[NRF-CRP15-2015-01] ; SSLS via NUS[C-380-003-003-001]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000760189000017

AMER ASSOC ADVANCEMENT SCIENCE

20220811695083

Calcium compounds ; Metal insulator boundaries ; Metal insulator transition ; Neodymium compounds ; Nickel compounds ; Praseodymium compounds ; Semiconductor doping ; Semiconductor insulator boundaries ; Temperature ; Thin films

Thermodynamics:641.1 ; Semiconducting Materials:712.1 ; Semiconductor Devices and Integrated Circuits:714.2

Web of Science

1.Natl Univ Singapore, Fac Sci, Dept Phys, Singapore 117551, Singapore
2.Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117575, Singapore
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
4.Natl Univ Singapore, Dept Elect & Comp Engn, 4 Engn Dr 3, Singapore 117583, Singapore
5.Natl Univ Singapore, Singapore Synchrotron Light Source SSLS, Singapore 117603, Singapore
6.ASTAR, Inst Mat Res & Engn, 2 Fusionopolis Way, Singapore 138634, Singapore
7.Shanghai Univ, Phys Dept, Shanghai Key Lab High Temp Superconductors, Shanghai 200444, Peoples R China

Zeng, Shengwei,Li, Changjian,Chow, Lin Er,et al. Superconductivity in infinite-layer nickelate La1-xCaxNiO2 thin films[J]. Science Advances,2022,8(7).

Zeng, Shengwei.,Li, Changjian.,Chow, Lin Er.,Cao, Yu.,Zhang, Zhaoting.,...&Ariando, Ariando.(2022).Superconductivity in infinite-layer nickelate La1-xCaxNiO2 thin films.Science Advances,8(7).

Zeng, Shengwei,et al."Superconductivity in infinite-layer nickelate La1-xCaxNiO2 thin films".Science Advances 8.7(2022).