A representation of the structure of polycrystalline La₃Ni₂O_7−δ.

From the article:

Evidence of Spin Density Waves in ${\mathrm{La}}_3{\mathrm{Ni}}_2{\mathrm{O}}_{7-\delta }$
Kaiwen Chen, Xiangqi Liu, Jiachen Jiao, Muyuan Zou, Chengyu Jiang, Xin Li, Yixuan Luo, Qiong Wu, Ningyuan Zhang, Yanfeng Guo, and Lei Shu
Phys. Rev. Lett. 132, 256503 (2024)

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