Direct atomic imaging of strained La3Ni2O7 films shows compressive strain lifts oxygen octahedral symmetry and that in-plane, rather than c-axis, lattice matching tracks superconductivity.
For consistency, we use the lattice convention shown in Fig
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Resolving Structural Origins for Superconductivity in Strain-Engineered La$_3$Ni$_2$O$_7$ Thin Films
Direct atomic imaging of strained La3Ni2O7 films shows compressive strain lifts oxygen octahedral symmetry and that in-plane, rather than c-axis, lattice matching tracks superconductivity.