Topochemical Synthesis and Electronic Structure of High-Crystallinity Infinite-Layer Nickelates on an Orthorhombic Substrate
Dong, Zhengang (City University of Hong Kong)
Hadjimichael, Marios (University of Warwick)
Mundet, Bernat (Institut Català de Nanociència i Nanotecnologia)
Choi, Jaewon (Diamond Light Source)
Tam, Charles C. (University of Bristol)
Garcia-Fernandez, Mirian (Diamond Light Source)
Agrestini, Stefano (Diamond Light Source)
Domínguez, Claribel (University of Geneva)
Bhatta, Regan (University of Florida)
Yu, Yue (University of Florida)
Liang, Yufeng (Lawrence Berkeley National Laboratory)
Wu, Zhenping (Beijing University of Posts and Telecommunications)
Triscone, Jean-Marc (University of Geneva)
Jia, Chunjing (University of Florida)
Zhou, Ke-Jin (Diamond Light Source)
Li, Danfeng (City University of Hong Kong)

Data:	2025
Resum:	Superconductivity in infinite-layer nickelates has stirred much research interest, to which questions regarding the nature of superconductivity remain elusive. A critical leap forward to address these intricate questions is through the growth of high-crystallinity infinite-layer nickelates, including the "parent" phase. Here, we report the synthesis of a high-quality thin-film nickelate, NdNiO. This is achieved through the growth of a perovskite precursor phase (NdNiO) of superior crystallinity on the NdGaO substrate by off-axis RF magnetron sputtering and a low-temperature topochemical reduction using NaH. We observe a nonlinear Hall effect at low temperatures in this "non-doped" phase. We further study the electronic properties using advanced X-ray scattering and first-principles calculations. We observe spectroscopic indications of the enhanced two-dimensionality and a reduced hybridization of Nd 5 d and Ni 3 d orbitals. These findings unlock new pathways for preparing high-quality infinite-layer nickelates and provide new insights into the intrinsic features of these compounds.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Infinite-layer nickelates ; Topochemistry ; NaH ; Orthorhombic substrates ; Off-axis RF magnetron sputtering ; Electronic structure
Publicat a:	Nano letters, Vol. 25, Num. 3 (January 2025) , p. 1233-1241, ISSN 1530-6992

DOI: 10.1021/acs.nanolett.4c06557
PMID: 39783860

9 p, 7.8 MB

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