Visualization of oxygen vacancies and self-doped ligand holes in La3Ni2O7−δ

Dong, Zehao; Huo, Mengwu; Li, Jie; Li, Jingyuan; Li, Pengcheng; Sun, Hualei; Gu, Lin; Lu, Yi; Wang, Meng; Wang, Yayu; Chen, Zhen

doi:10.1038/s41586-024-07482-1

Cited by 34 publications

(5 citation statements)

References 59 publications

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“…The cutting-edge multislice electron ptychography (MEP) TEM technique has been adopted to visualize oxygen microscopically in single crystals of the bilayer structural La3Ni2O 7−𝛿 . [46] The results reveal the inhomogeneity of oxygen vacancies in a length scale of 40 Å. The oxygen vacancies 𝛿 spanning from 0 to 0.34 are mainly located on the inner-apical oxygen site, as shown in Fig.…”

Section: Reviewmentioning

confidence: 66%

“…[60] This contrasts with the electronic structure of infinite-layer nickelates. [61,62] Furthermore, high-resolution EELS at the atomic plane level [46] revealed substantial 𝑝-𝑑 hybridization in the 2𝑝 orbitals of both inner apical and planar oxygen atoms (Fig. 9).…”

Section: -6mentioning

confidence: 95%

“…2, especially for the inner apical oxygen sites that connect two NiO6 octahedra along the 𝑐 axis. [46] The inner apical oxygen vacancies suppress the direct interlayer couplings. [48] Based on a recent report, the pressure-driven superconductivity shows a phase region with a right-triangle shape and persists up to 90 GPa.…”

Section: Reviewmentioning

confidence: 99%

“…Electron energy loss spectroscopy (EELS) of the O-𝐾 edge, [46] combined with x-ray absorption spectroscopy at the O 𝐾-edge and Ni 𝐿3-edge, [14] indicates that the O-2𝑝 band in La3Ni2O7 is partially filled, akin to cuprates within the Zaanen-Sawatzky-Allen framework. [60] This contrasts with the electronic structure of infinite-layer nickelates.…”

Section: -6mentioning

confidence: 99%

“…[(e), (f)] X-ray absorption spectra of La 3 Ni 2 O 7 (red filled circles), NiO and NdNiO 3 (black filled circles), taken at the O 𝐾-edge and Ni 𝐿 3 -edge, respectively. Here (a)-(d) are taken from Ref [46]. and (e)-(f) from Ref [14]…”

mentioning

confidence: 99%

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Normal and Superconducting Properties of La₃Ni₂O₇

Wang 王,

Wen 闻,

Wu 吴

et al. 2024

Chinese Phys. Lett.

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This review provides a comprehensive overview of current research on the structural, electronic, and magnetic characteristics of the recently discovered high-temperature superconductor La3Ni2O7 under high pressures. We present the experimental results for synthesizing and characterizing this material, derived from measurements of transport, thermodynamics, and various spectroscopic techniques, and discuss their physical implications. We also explore theoretical models proposed to describe the electronic structures and superconducting pairing symmetry in La3Ni2O7, highlighting the intricate interplay between electronic correlations and magnetic interactions. Despite these advances, challenges remain in growing high-quality samples free of extrinsic phases and oxygen deficiencies and in developing reliable measurement tools for determining diamagnetism and other physical quantities under high pressures. Further investigations in these areas are essential to deepening our understanding of the physical properties of La3Ni2O7 and unlocking its superconducting pairing mechanism.

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Section: Reviewmentioning

confidence: 66%

Section: -6mentioning

confidence: 95%

Section: Reviewmentioning

confidence: 99%

Section: -6mentioning

confidence: 99%

mentioning

confidence: 99%

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Normal and Superconducting Properties of La₃Ni₂O₇

Wang 王,

Wen 闻,

Wu 吴

et al. 2024

Chinese Phys. Lett.

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Oxygen Ion Pumping across Atomically Designed Oxide Heterointerfaces

Wu,

Zhang,

Zhang

et al. 2024

Adv Funct Materials

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Complex oxide heterointerfaces and heterostructures have demonstrated enormous emergent phenomena over the last decades, attributed to the reconstructions of mis‐matched crystalline structure, polarity, and spin ordering across the heterointerfaces. This work employs the heterostructures of La0.7Sr0.3MnO3 and CaFeO2.5 as model system to demonstrate an interface‐specific oxygen migration/reconstruction across the interfaces due to the mismatched chemical potential, which dramatically influences the ferromagnetic and electronic states of La0.7Sr0.3MnO3 layer. Specifically, the alternative stacking of octahedral (Oh) and tetrahedral (Td) layers in CaFeO2.5 are used to form two distinct heterointerfaces, namely the Oh‐Td and the Oh‐Oh interfaces with the adjacent La0.7Sr0.3MnO3 layer. Interestingly, the oxygen ion migrates toward opposite directions across the interface for these two cases, in which the CaFeO2.5 layer acts as an “oxygen pump” and manipulates the oxygen contents of its adjacent La0.7Sr0.3MnO3 layers. Such manipulation leads to a dramatically changed ferromagnetic transition temperature for the heterostructure with the Oh‐Td and Oh‐Oh interface. This work establishes a feasible and efficient strategy to control the oxygen ionic distribution through atomic‐scale interface design and opens up new opportunities to exploit emergent states at the complex oxide heterostructures through selective oxygen ion evolution.

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p‐Orbital Ferromagnetism Arising from Unconventional O⁻ Ionic State in a New Semiconductor Sr₂AlO₄ with Insufficiently Bonded Oxygen

Zheng,

Xu,

Uchiyama

et al. 2024

Advanced Science

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Oxygen in solids usually exists in an O2− ionic state. As a result, it loses its magnetic nature of a single atom, wherein two unpaired electrons exist in its outer 2p orbitals. Here, it is shown that an unconventional stable ionic state of O− is realized in a new semiconductor material Sr2AlO4, leading to an intrinsic p‐orbital ferromagnetism stable until ≈900 K. Experimental and theoretical investigations have clarified that one‐fourth of the oxygen atoms in Sr2AlO4 are insufficiently bonded in the crystal structure, resulting in a unique O−‐state and p‐orbital ferromagnetism. To date, the O− state is reported to exist only in non‐equilibrium conditions, and p‐orbital magnetism is only suggested in impurity bands with small ferromagnetic moments. The present work provides a new route for creating ferromagnetism in semiconductors and exploring new p‐orbital physics and chemistry. In addition, the material shows elastic‐mechanoluminescence that may enable unprecedented mechano‐photonic‐spintronics.

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Visualization of oxygen vacancies and self-doped ligand holes in La3Ni2O7−δ

Cited by 34 publications

References 59 publications

Normal and Superconducting Properties of La₃Ni₂O₇

Normal and Superconducting Properties of La₃Ni₂O₇

Oxygen Ion Pumping across Atomically Designed Oxide Heterointerfaces

p‐Orbital Ferromagnetism Arising from Unconventional O⁻ Ionic State in a New Semiconductor Sr₂AlO₄ with Insufficiently Bonded Oxygen

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Visualization of oxygen vacancies and self-doped ligand holes in La3Ni2O7−δ

Cited by 34 publications

References 59 publications

Normal and Superconducting Properties of La3Ni2O7

Normal and Superconducting Properties of La3Ni2O7

Oxygen Ion Pumping across Atomically Designed Oxide Heterointerfaces

p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded Oxygen

Contact Info

Product

Resources

About

Normal and Superconducting Properties of La₃Ni₂O₇

Normal and Superconducting Properties of La₃Ni₂O₇

p‐Orbital Ferromagnetism Arising from Unconventional O⁻ Ionic State in a New Semiconductor Sr₂AlO₄ with Insufficiently Bonded Oxygen