Preprint
Sep 2026
Heavily Sr-Doped La$_{2}$SrNi$_{2}$O$_{7-{\delta}}$ as a Tetragonal Ruddlesden-Popper Phase at Ambient Pressure
High-temperature superconductivity has been found in bilayer Ruddlesden-Popper (RP) nickelates in bulk samples under high pressure, or in thin films via compressive strain. In the superconducting state, a tetragonal structure with a straight Ni-O-Ni bond along c-axis has been commonly observed, together with the suppre...
Yu-Hang Zhang, Ming Xue, Cui-Qun Chen et al.
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