On the Topotactic Phase Transition Achieving Superconducting Infinite-Layer Nickelates

Détails bibliographiques
Publié dans:	Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 40 vom: 01. Okt., Seite e2402484
Auteur principal:	Li, Yan (Auteur)
Autres auteurs:	Liu, Changjiang, Zheng, Hong, Jiang, Jidong Samuel, Zhu, Zihua, Yan, Xi, Cao, Hui, Narayanachari, K V L V, Paudel, Binod, Koirala, Krishna Prasad, Zhang, Zhan, Fisher, Brandon, Wang, Huanhua, Karapetrova, Evguenia, Sun, Chengjun, Kelly, Shelly, Phelan, Daniel, Du, Yingge, Buchholz, Bruce, Mitchell, J F, Bhattacharya, Anand, Fong, Dillon D, Zhou, Hua
Format:	Article en ligne
Langue:	English
Publié:	2024
Accès à la collection:	Advanced materials (Deerfield Beach, Fla.)
Sujets:	Journal Article in situ X‐ray characterization infinite‐layer nickelates oxygen octahedral rotation time‐of‐flight secondary ion mass spectrometry topotactic phase transition

Description
Résumé:	© 2024 The Author(s). Advanced Materials published by Wiley‐VCH GmbH. Topotactic reduction is critical to a wealth of phase transitions of current interest, including synthesis of the superconducting nickelate Nd0.8Sr0.2NiO2, reduced from the initial Nd0.8Sr0.2NiO3/SrTiO3 heterostructure. Due to the highly sensitive and often damaging nature of the topotactic reduction, however, only a handful of research groups have been able to reproduce the superconductivity results. A series of in situ synchrotron-based investigations reveal that this is due to the necessary formation of an initial, ultrathin layer at the Nd0.8Sr0.2NiO3 surface that helps to mediate the introduction of hydrogen into the film such that apical oxygens are first removed from the Nd0.8Sr0.2NiO3 / SrTiO3 (001) interface and delivered into the reducing environment. This allows the square-planar / perovskite interface to stabilize and propagate from the bottom to the top of the film without the formation of interphase defects. Importantly, neither geometric rotations in the square planar structure nor significant incorporation of hydrogen within the films is detected, obviating its need for superconductivity. These findings unveil the structural basis underlying the transformation pathway and provide important guidance on achieving the superconducting phase in reduced nickelate systems
Description:	Date Revised 03.10.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1521-4095
DOI:	10.1002/adma.202402484