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. 2020 Sep 2;8(8):nwaa218. doi: 10.1093/nsr/nwaa218

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© The Author(s) 2021. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Crystal structures and Brillouin zones. The crystals of the two end members LaNiO₂ (n = ∞, P4/mmm) and La₃Ni₂O₆ (n = 2, I4/mmm) are presented in (a) and (b), respectively. The panel (a) contains six unit cells of LaNiO₂ (c is the lattice parameter in the direction). The primitive reciprocal lattice vectors and high-symmetry k points are indicated in the first Brillouin zones of (c) LaNiO₂ and (d) La₃Ni₂O₆. a^*, b^* and c^* refer to the primitive reciprocal lattice vectors.

Inline graphic — Crystal structures and Brillouin zones. The crystals of the two end members LaNiO₂ (n = ∞, P4/mmm) and La₃Ni₂O₆ (n = 2, I4/mmm) are presented in (a) and (b), respectively. The panel (a) contains six unit cells of LaNiO₂ (c is the lattice parameter in the direction). The primitive reciprocal lattice vectors and high-symmetry k points are indicated in the first Brillouin zones of (c) LaNiO₂ and (d) La₃Ni₂O₆. a^*, b^* and c^* refer to the primitive reciprocal lattice vectors.