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Title: Long-Range Structural Order in a Hidden Phase of Ruddlesden–Popper Bilayer Nickelate La 3 Ni 2 O 7

Journal Article · · Inorganic Chemistry

The recent discovery of superconductivity in the Ruddlesden–Popper bilayer nickelate, specifically La3Ni2O7, has generated significant interest in the exploration of high-temperature superconductivity within this material family. In this study, we present the crystallographic and electrical resistivity properties of two distinct Ruddlesden–Popper nickelates: the bilayer La3Ni2O7 (referred to as 2222-phase) and a previously uncharacterized phase, La3Ni2O7 (1313-phase). The 2222-phase is characterized by a pseudo F-centered orthorhombic lattice, featuring bilayer perovskite [LaNiO3] layers interspaced by rock salt [LaO] layers, forming a repeated ...2222... sequence. Intriguingly, the 1313-phase, which displays semiconducting properties, crystallizes in the Cmmm space group and exhibits a pronounced predilection for a C-centered orthorhombic lattice. Within this structure, the perovskite [LaNiO3] layers exhibit a distinctive long-range ordered arrangement, alternating between single- and trilayer configurations, resulting in a ...1313... sequence. This report contributes to novel insights into the crystallography and the structure–property relationship of Ruddlesden–Popper nickelates, paving the way for further investigations into their unique physical properties.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
SC0023648; FA9550-23-1-0502
OSTI ID:
2318747
Alternate ID(s):
OSTI ID: 2324892
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Vol. 63 Journal Issue: 11; ISSN 0020-1669
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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