Observation of perfect diamagnetism and interfacial effect on the electronic structures in infinite layer Nd0.8Sr0.2NiO2 superconductors

被引：48

作者：

Zeng, S. W. ^{[1
]}

Yin, X. M. ^{[2
,3
]}

Li, C. J. ^{[4
,5
]}

Chow, L. E. ^{[1
]}

Tang, C. S. ^{[2
,6
]}

Han, K. ^{[1
,7
,8
]}

Huang, Z. ^{[1
,7
,8
]}

Cao, Y. ^{[9
]}

Wan, D. Y. ^{[1
]}

Zhang, Z. T. ^{[1
]}

Lim, Z. S. ^{[1
]}

Diao, C. Z. ^{[2
]}

Yang, P. ^{[2
,4
]}

Wee, A. T. S. ^{[1
,2
]}

Pennycook, S. J. ^{[4
]}

Ariando, A. ^{[1
]}

机构：

[1] Natl Univ Singapore, Fac Sci, Dept Phys, Singapore 117551, Singapore

[2] Natl Univ Singapore, Singapore Synchrotron Light Source SSLS, 5 Res Link, Singapore 117603, Singapore

[3] Shanghai Univ, Phys Dept, Shanghai Key Lab High Temp Superconductors, Shanghai 200444, Peoples R China

[4] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117575, Singapore

[5] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

[6] ASTAR, Inst Mat Res & Engn, 2 Fusionopolis Way, Singapore 138634, Singapore

[7] Anhui Univ, Inst Phys Sci, Informat Mat & Intelligent Sensing Lab Anhui Prov, Hefei 230601, Anhui, Peoples R China

[8] Anhui Univ, Inst Informat Technol, Informat Mat & Intelligent Sensing Lab Anhui Prov, Hefei 230601, Anhui, Peoples R China

[9] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117583, Singapore

来源：

NATURE COMMUNICATIONS | 2022年 / 13卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

D O I：

10.1038/s41467-022-28390-w

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Nickel-based complex oxides have served as a playground for decades in the quest for a copper-oxide analog of the high-temperature superconductivity. They may provide clues towards understanding the mechanism and an alternative route for high-temperature superconductors. The recent discovery of superconductivity in the infinite-layer nickelate thin films has fulfilled this pursuit. However, material synthesis remains challenging, direct demonstration of perfect diamagnetism is still missing, and understanding of the role of the interface and bulk to the superconducting properties is still lacking. Here, we show high-quality Nd0.8Sr0.2NiO2 thin films with different thicknesses and demonstrate the interface and strain effects on the electrical, magnetic and optical properties. Perfect diamagnetism is achieved, confirming the occurrence of superconductivity in the films. Unlike the thick films in which the normal-state Hall-coefficient changes signs as the temperature decreases, the Hall-coefficient of films thinner than 5.5 nm remains negative, suggesting a thickness-driven band structure modification. Moreover, X-ray absorption spectroscopy reveals the Ni-O hybridization nature in doped infinite-layer nickelates, and the hybridization is enhanced as the thickness decreases. Consistent with band structure calculations on the nickelate/SrTiO3 heterostructure, the interface and strain effect induce a dominating electron-like band in the ultrathin film, thus causing the sign-change of the Hall-coefficient. Nickelate superconductors attract enormous attention in the field of high-temperature superconductivity. Here the authors report observation of perfect diamagnetism and interfacial effect on the electronic structures in infinite layer Nd0.8Sr0.2NiO2 superconductors.

引用

页数：6