Possible strain-induced enhancement of the superconducting onset transition temperature in infinite-layer nickelates

• DOI: 10.1038/s42005-023-01464-x
• Publication Date: 2023-11-27T07:02:28Z
• Authors: Xiaolin Ren; Jiarui Li; Wei-Chih Chen; Qiang Gao; Joshua J. Sanchez; Jordyn Hales; Hailan Luo; Fanny Rodolakis; Jessica L. McChesney; Tao Xiang; Jiangping Hu; Riccardo Comin; Yao Wang; Xingjiang Zhou; Zhihai Zhu
• Keywords: Superconducting transition temperature; Transition temperature; Non-blocking I/O; Strain (injury)

AbstractThe mechanism of unconventional superconductivity in correlated materials remains a great challenge in condensed matter physics. The recent discovery of superconductivity in infinite-layer nickelates, as an analog to high-Tc cuprates, has opened a new route to tackle this challenge. By growing 8 nm Pr0.8Sr0.2NiO2 films on the (LaAlO3)0.3(Sr2AlTaO6)0.7 substrate, we successfully raise the superconducting onset transition temperature Tc in the widely studied SrTiO3-substrated nickelates from 9 K into 15 K, which indicates compressive strain is an efficient protocol to further enhance superconductivity in infinite-layer nickelates. Additionally, the x-ray absorption spectroscopy, combined with the first-principles and many-body simulations, suggest a crucial role of the hybridization between Ni and O orbitals in the unconventional pairing. These results also suggest the increase of Tc be driven by the change of charge-transfer nature that would narrow the origin of general unconventional superconductivity in correlated materials to the covalence of transition metals and ligands.