CHEN Zhuoyu; HUANG Haoliang; XUE Qikun

doi:10.7498/aps.74.20250331

Abstract

In recent years, significant progress has been made in the superconductivity of nickelates, with global teams discovering various nickelate superconductors under ambient and high pressure conditions. Research teams in China and USA have independently discovered ambient-pressure superconductivity in Ruddlesden-Popper bilayer nickelate thin films through different technical pathways, establishing a novel platform for probing high-temperature superconducting mechanisms. The Chinese teams have synthesized pure-phase bilayer nickelate films with atomically smooth surfaces by using their proprietary Gigantic-Oxidative Atomic-Layer-by-Layer Epitaxy (GOALL-Epitaxy) technique. After in situ strong oxidation processing of surface, surface-sensitive measurements, such as ARPES, can be conducted on these atomically flat films to reveal the electronic structure of the superconducting phase, and further in-depth experimental research on superconducting mechanisms is expected. Through synergistic efforts in lattice engineering, rare-earth/alkaline-earth element substitution, and interface strain engineering, this system has the potential to achieve higher superconducting transition temperatures.

Keywords:

high-temperature superconductivity /
nickelate thin film /
gigantic-oxidative atomic-layer-by-layer epitaxy

Authors and contacts

Corresponding author: CHEN Zhuoyu, chenzhuoyu@sustech.edu.cn ; XUE Qikun, xueqk@sustech.edu.cn

Funds: Project supported by the National Key R&D Program of China (Grant Nos. 2024YFA1408101, 2022YFA1403101), the National Natural Science Foundation of China (Grant Nos. 92265112, 12374455, 52388201), the Quantum Science Strategic Initiative of Guangdong Province, China (Grant Nos. GDZX2401004, GDZX2201001), the Municipal Funding Co-Construction Program of Shenzhen, China (Grant Nos. SZZX2401001, SZZX2301004), and the Science and Technology Program of Shenzhen, China (Grant No. KQTD20240729102026004).

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Vol. 74, Issue 9 - 2025-05-05

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