Pressure-Induced Phase Transitions in Bilayer La₃Ni₂O₇

2024/10/24 by Mingyu Xu, Greeshma C. Jose, Xu, Mingyu +15 · 1 citation
Chemistry · Earth and Planetary Sciences · Materials Science · #Chemical Thermodynamics and Molecular Structure #FOS: Physical sciences #High-pressure geophysics and materials #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.2410.18840

openalex publication_date 2024/10/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

La₃Ni₂O₇ exists in two polymorphs: an unconventional structure with alternating layers of single- and triple-layered nickel-oxygen octahedra, and a classical double-layered Ruddlesden-Popper phase. In this study, we report the growth of single crystals of classical double-layered La₃Ni₂O₇ using the floating zone method. Structural characterization under pressures up to 15.4 GPa reveals a gradual transition from orthorhombic to tetragonal symmetry near 12 GPa. Additionally, we present pressure and field-dependent electrical resistance measurements under pressures as high as 27.4 GPa, from which we construct a phase diagram.

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