Spontaneous phase segregation of Sr
 2
 NiO
 3
 and SrNi
 2
 O
 3
 during SrNiO
 3
 heteroepitaxy

Wang, Le; Yang, Zhenzhong; Yin, Xinmao; Taylor, Sandra D.; He, Xu; Tang, Chi Sin; Bowden, Mark E.; Zhao, Jiali; Liu, Jishan; Perea, Daniel E.; Wangoh, Linda; Wee, Andrew Thye Shen; Zhou, Hua; Chambers, Scott A.; Du, Yingge

doi:10.1126/sciadv.abe2866

Cited by 15 publications

(5 citation statements)

References 58 publications

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“…In this sense, Eu acts as a charge reservoir as its valence changes during growth and reduction. Because the synthesis of EuNiO 3 is easier than SrNiO 3 ( 21 ), exploring the phase diagram in the overdoped ( x > 0.5) infinite-layer nickelates may be facilitated.…”

Section: Resultsmentioning

confidence: 99%

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Wei

Zhang

et al. 2023

Sci. Adv.

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We report on superconductivity in Nd 1− x Eu x NiO 2 using Eu as a 4f dopant of the parent NdNiO 2 infinite-layer compound. We use an all–in situ molecular beam epitaxy reduction process to achieve the superconducting phase, providing an alternate method to the ex situ CaH 2 reduction process to induce superconductivity in the infinite-layer nickelates. The Nd 1− x Eu x NiO 2 samples exhibit a step-terrace structure on their surfaces, have a T c onset of 21 K at x = 0.25, and have a large upper critical field that may be related to Eu 4f doping.

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Section: Resultsmentioning

confidence: 99%

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Wei

Zhang

et al. 2023

Sci. Adv.

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“…From the methodological perspective, SW-RIXS has demonstrated its potential in studying the interfacial distributions of RIXS excitations, such as the fluorescence, magnetic, and dd excitations. Recent works that reported high quality epitaxial nickelate thin films 24,69,70 by MBE and PLD have drawn much attention. For example, the 14 SrNiO3/LaFeO3 SL offer the evidence of a superior control of valence states from Ni 3+ to Ni 4+ through the thickness of constituent layers.…”

Section: Discussionmentioning

confidence: 99%

Probing the polar-nonpolar oxide interfaces using resonant x-ray standing wave techniques

Kuo

Lin

Chuang

2021

Journal of Vacuum Science &Amp; Technology A

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Transition metal (TM) oxide heterostructure superlattices have attracted great attention in research communities because of their emergent interfacial phenomena that do not exist in the bulk form. In order to understand the mechanisms that cause these phenomena, it is important to use depth-resolved spectroscopies to study the electronic structure across the buried oxide interfaces. In this review, we focus on the recent applications of standing wave (SW) photoemission (SW-XPS) and resonant inelastic x-ray scattering (SW-RIXS) spectroscopy to study the depth profiles of electronic structure or carriers around the polarnonpolar oxide interfaces. Using the incident photon energies near the TM x-ray absorption resonance, the created SW excitation can enhance the spectral response and certain electronic transitions, providing important insight into the interfacial electronic structure in the energy and real space regimes. Following the background introductions, we describe two SW experiments and demonstrate that the combination of SW-XPS and SW-RIXS has the potential to obtain the depth distribution of electronic/orbital states around the buried interfaces with Angstrom precision.

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“…Rare earth nickelates have a typical perovskite structure, ABO 3 (A and B are cations of different volumes), where A-site is a rare earth atom surrounded by eight NiO 6 octahedrons and have garnered significant attention due to their unique electronic structures and rich phase diagram. − Among them, LaNiO 3 stands out with its metallic behavior and bifunctional catalytic activity. − Through the process of Sr-doping and other treatment techniques, the observation of charge density waves and the emergence of superconductivity have raised further interest among the family of nickelates. − Meanwhile, LaNiO 3 is a typical correlated metal located near the MIT boundary. By substituting the A-site with other rare earth ions, or by confinement, it is possible to induce a transition to a Mott insulator.…”

Section: Introductionmentioning

confidence: 99%

Tunable Collective Excitations in Epitaxial Perovskite Nickelates

Sun,

He,

Chen

et al. 2024

ACS Photonics

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The formation of plasmons through the collective excitation of charge density has generated intense discussions, offering insights into fundamental sciences and potential applications. While the underlying physical principles have been well-established, the effects of many-body interactions and orbital hybridization on plasmonic dynamics remain understudied. In this work, we present the observation of conventional metallic and correlated plasmons in epitaxial La 1−x Sr x NiO 3 (LSNO) films with varying Sr doping concentrations (x = 0, 0.125, 0.25), unveiling their intriguing evolution. Unlike samples at other doping concentrations, the x = 0.125 intermediate doping sample does not exhibit the correlated plasmons despite showing high optical conductivity. Through a comprehensive experimental investigation using spectroscopic ellipsometry and X-ray absorption spectroscopy, the O2p-Ni3d orbital hybridization for LSNO with a doping concentration of x = 0.125 is found to be significantly enhanced, alongside a considerable weakening of its effective correlation U*. These factors account for the absence of correlated plasmons and the high optical conductivity observed in LSNO (0.125). Our results underscore the profound impact of orbital hybridization on the electronic structure and the formation of plasmons in strongly correlated systems. This in turn suggests that LSNO could serve as a promising alternative material in optoelectronic devices.

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Spontaneous phase segregation of Sr ₂ NiO ₃ and SrNi ₂ O ₃ during SrNiO ₃ heteroepitaxy

Cited by 15 publications

References 58 publications

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Probing the polar-nonpolar oxide interfaces using resonant x-ray standing wave techniques

Tunable Collective Excitations in Epitaxial Perovskite Nickelates

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Spontaneous phase segregation of Sr 2 NiO 3 and SrNi 2 O 3 during SrNiO 3 heteroepitaxy

Cited by 15 publications

References 58 publications

Superconducting Nd 1− x Eu x NiO 2 thin films using in situ synthesis

Superconducting Nd 1− x Eu x NiO 2 thin films using in situ synthesis

Probing the polar-nonpolar oxide interfaces using resonant x-ray standing wave techniques

Tunable Collective Excitations in Epitaxial Perovskite Nickelates

Contact Info

Product

Resources

About

Spontaneous phase segregation of Sr ₂ NiO ₃ and SrNi ₂ O ₃ during SrNiO ₃ heteroepitaxy

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis