Epitaxial growth and electronic structure of Ruddlesden–Popper nickelates (Lan+1NinO3n+1, n = 1–5)

Li, Z.; Guo, Wei; Zhang, T. T.; Song, Jie; Gao, Tianyi; Gu, Zheng‐Bin; Nie, Yuefeng

doi:10.1063/5.0018934

Cited by 39 publications

(26 citation statements)

References 38 publications

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“…Although unintentional formation of inclusions of Ruddlesden–Popper phase and associated local elongation of the out-of-plane lattice parameter may occur, such inclusions do not produce an overall out-of-plane elongation in epitaxial films of nickelates 21 – 23 . Concurrently, a hypothetical elongation due to dominating fraction of the Ruddlesden–Popper phase should have been accompanied by the corresponding additional x-ray diffraction peaks 24 , which is not the case here (Supplementary section S1).…”

Section: Resultsmentioning

confidence: 73%

Anisotropic chemical expansion due to oxygen vacancies in perovskite films

Tyunina

Pacherová

Kocourek

et al. 2021

Sci Rep

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In scientifically intriguing and technologically important multifunctional ABO3 perovskite oxides, oxygen vacancies are most common defects. They cause lattice expansion and can alter the key functional properties. Here, it is demonstrated that contrary to weak isotropic expansion in bulk samples, oxygen vacancies produce strong anisotropic strain in epitaxial thin films. This anisotropic chemical strain is explained by preferential orientation of elastic dipoles of the vacancies. Elastic interaction of the dipoles with substrate-imposed misfit strain is suggested to define the dipolar orientation. Such elastic behavior of oxygen vacancies is anticipated to be general for perovskite films and have critical impacts on the film synthesis and response functions.

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Section: Resultsmentioning

confidence: 73%

Anisotropic chemical expansion due to oxygen vacancies in perovskite films

Tyunina

Pacherová

Kocourek

et al. 2021

Sci Rep

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“…This circumstance has raised the question of the role of the 4f electrons [9] as well as of extrinsic factors such as the unintentional presence of topotatic hydrogen or apical oxygens, which have been argued to correlate with the structure [10,11]. Examining the RNiO 2 series for R from La to Lu as well as additional candidate materials for nickelate superconductivity has thus emerged as a consequential outlook [12][13][14][15][16][17][18][19][20][21][22][23][24]. At the same time, in analogy with their perovskite counterparts [25][26][27], the appearance of structural instabilities associated to the relative size of the R atom may also come into play as an additional key ingredient.…”

Section: Introductionmentioning

confidence: 99%

Geometric effects in the infinite-layer nickelates

Bernardini,

Bosin,

Cano

2021

Preprint

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Geometric effects in the infinite-layer nickelates RNiO2 associated with the relative size of the R-site atom are investigated via first-principles calculations. We consider, in particular, the prospective YNiO2 material to illustrate the impact of these effects. We find that the presence of topotactic hydrogens can be precluded at the expense of an increase in both self-doping effect and eg hybridization that deteriorates the cuprate-like electronic picture. Furthermore, we find that these geometric effects introduce a quantum critical point in the RNiO2 series. This implies a P 4/mmm ↔ I4/mcm structural transformation associated to a A + 3 normal mode, according to which the oxygen squares undergo an in-plane rotation around Ni that alternates along c. We find that such a A + 3 -mode instability has a generic character in the infinite-layer nickelates and can be tuned via either the effective R-site atom size or epitaxial strain.

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“…In this context, the (so far) little studied n 6 and n 4 members of the series [73] may provide some prospect for superconductivity. Oxygen-reduced samples of these materials are so far lacking (though the n 4 member of the RP series has been epitaxially grown [93]), and even if they are synthesized, they might require additional chemical tuning to achieve superconductivity. They share a similar electronic structure to the n 5 material, but with slightly different nominal filling of the 3d bands [73].…”

Section: Discussionmentioning

confidence: 99%

Low Valence Nickelates: Launching the Nickel Age of Superconductivity

et al. 2022

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The discovery of superconductivity in thin films (∼10 nm) of infinite-layer hole-doped NdNiO2 has invigorated the field of high temperature superconductivity research, reviving the debate over contrasting views that nickelates that are isostructural with cuprates are either 1) sisters of the high temperature superconductors, or 2) that differences between nickel and copper at equal band filling should be the focus of attention. Each viewpoint has its merits, and each has its limitations, suggesting that such a simple picture must be superseded by a more holistic comparison of the two classes. Several recent studies have begun this generalization, raising a number of questions without suggesting any consensus. In this paper, we organize the findings of the electronic structures of n-layered NiO2 materials (n = 1 to ∞) to outline (ir)regularities and to make comparisons with cuprates, with the hope that important directions of future research will emerge.

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Epitaxial growth and electronic structure of Ruddlesden–Popper nickelates (Lan+1NinO3n+1, n = 1–5)

Cited by 39 publications

References 38 publications

Anisotropic chemical expansion due to oxygen vacancies in perovskite films

Anisotropic chemical expansion due to oxygen vacancies in perovskite films

Geometric effects in the infinite-layer nickelates

Low Valence Nickelates: Launching the Nickel Age of Superconductivity

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