Signatures of pressure-induced high-temperature superconductivity in nickelates have sparked great interest in these materials. Here, the sensitivity of Ruddlesden–Popper nickelate formation to in-plane misfit strain is investigated, revealing that tensile strain favours the perovskite structure LaNiO3, whereas compressive strain stabilizes the La3Ni2O7 phase where high-temperature superconductivity was reported.
- Ting Cui
- Songhee Choi
- Er-Jia Guo