Author

Cui-Qun Chen

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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. · 1 citation

Preprint Sep 2026

Electronic structure and two-orbital model of the quadlayer La$_5$Ni$_4$O$_{13}$

The discovery of pressure-induced superconductivity in Ruddlesden--Popper (RP) nickelates has stimulated extensive interest in high-T$_c$ superconductors. Here, we systematically study the electronic properties of the quadlayer RP nickelate La$_5$Ni$_4$O$_{13}$ under ambient pressure, 5% isotropic compressive strain, a...

Jian-Xiang Sun, Hao-Kan Xiao, Cui-Qun Chen et al. · 0 citations