The 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-
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Abstract T ccuprates, has opened a new route to tackle this challenge. By growing 8 nm Pr0.8Sr0.2NiO2films on the (LaAlO3)0.3(Sr2AlTaO6)0.7substrate, we successfully raise the superconducting onset transition temperatureT cin 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 ofT c 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. -
Li, Jiarui ; Green, Robert J. ; Zhang, Zhen ; Sutarto, Ronny ; Sadowski, Jerzy T. ; Zhu, Zhihai ; Zhang, Grace ; Zhou, Da ; Sun, Yifei ; He, Feizhou ; et al ( , Physical Review Letters)null (Ed.)