Temperature-Dependent Structural Evolution of Ruddlesden-Popper Bilayer Nickelate La₃Ni₂O₇.

ABSTRACT: A recent article ( J. Am. Chem. Soc. 2024, 146, 7506-7514) details a pressure-temperature (P-T) phase diagram for the Ruddlesden-Popper bilayer nickelate La₃Ni₂O₇ (LNO-2222) using synchrotron X-ray diffraction. This study identifies a phase transition from Amam (#63) to Fmmm (#69) within the temperature range of 104-120 K under initial pressure and attributes the I4/mmm (#139) space group to the structure responsible for the superconductivity of LNO-2222. Herein, we examine the temperature-dependent structural evolution of LNO-2222 single crystals at ambient pressure. Contrary to the symmetry increase and the established Amam-Fmmm phase boundary, we observe an enhancement in the Amam refl

SUBMITTER: Wang H 

PROVIDER: S-EPMC11752513 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature