Charge disproportionation of Mn 
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 and O 
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 electronic states depending on strength of 
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 hybridization in 
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Nakao, Hironori; Tabata, Chihiro; Murakami, Youichi; Yamasaki, Y.; Yamada, Hiroyuki; Ishihara, Sumio; Kawasaki, Masashi

doi:10.1103/physrevb.98.245146

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…While conventional metallic plasmons have been observed in multiple strongly correlated transition metal oxides, − note that theoretical studies have revealed the interaction of both short- and long-range correlations in Mott insulating systems that can produce unconventional plasmons known as “correlated plasmons” which possess multiple ordered photon energies . These correlated plasmons have been experimentally observed in niobates, cuprates, and topological materials such as Bi 2 Se 3 , where charge-spin coupling plays an important role in the formation of correlated plasmons. ,, Meanwhile, orbital hybridization between the metallic 3d and oxygen 2p orbitals has been pivotal in accounting for multiple quantum phenomena in strongly correlated systems − and their role in mediating the formation of plasmons remains largely an unchartered research frontier that requires further investigation. Moreover, as correlated plasmons are intimately related to long-range charge correlations, , the detection of these unconventional plasmons holds the potential to reveal valuable insights into the underlying mechanisms that result in their formation.…”

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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Section: Introductionmentioning

confidence: 99%

Tunable Collective Excitations in Epitaxial Perovskite Nickelates

Sun,

He,

Chen

et al. 2024

ACS Photonics

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“…Particularly studied are LaMnO 3 |SrMnO 3 superlattices, where various magnetic and electronic ground states across the metal-insulator transition can be tuned [10,[46][47][48][49][50]. This is achieved by varying their period or component ratio [47,48,51], which is a way to modulate the tunneling of e g electrons across the interface [48]; orbital [52] and charge [53] order were also reported. More exotic phenomena, including correlated topological states, may be expected when passing from the (001) orientation to the (111) orientation, because of the large polarity and a peculiar symmetry-driven epitaxial strain [54,55].…”

Section: Introductionmentioning

confidence: 99%

Persistent half-metallic ferromagnetism in a (111)-oriented manganite superlattice

Cossu,

Kim,

Sanyal

et al. 2021

Preprint

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Heterostructures of mixed-valence manganites are still under intense scrutiny, due to the occurrence of exotic quantum phenomena linked to electronic correlation and interfacial composition. For instance, if two anti-ferromagnetic insulators as LaMnO 3 and SrMnO 3 are grown in a (001)-oriented superlattice, a half-metallic ferromagnet may form, provided that the thickness is sufficiently small to allow tunneling across interfaces. In this article, we employ electronic structure calculations to show that all the layers of a (111)-oriented LaMnO 3 |SrMnO 3 superlattice retain a half-metallic ferromagnetic character for a much larger thickness than in its (001) counterpart. This behavior is shown to be linked to the charge transfer across the interface, favored by the octahedral connectivity between the layers. This also results in a symmetry-induced quenching of the Jahn-Teller distortions, which are replaced by breathing modes. The latter are coupled to charge and spin oscillations, whose components have a pure e g character. Most interestingly, the magnetization reaches its maximum value inside the LaMnO 3 region and not at the interface, which is fundamentally different from what observed for the (001) orientation. The analysis of the inter-atomic exchange coupling shows that the magnetic order arises from the double-exchange mechanism, despite competing interactions inside the SrMnO 3 region. Finally, the van Vleck distortions and the spin oscillations are found to be crucially affected by the variation of Hund's exchange and charge doping, which allows us to speculate that our system behaves as a Hund's metal, creating an interesting connection between manganites and nickelates.

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“…LaMnO 3 (LMO) films are attracting extensive attention as an indispensable component part in many artificially constructed heterostructures which exhibit extraordinary interfacial phenomena, such as exchange bias in LMO/LaNiO 3 superlattices, 1 charge transfer in LMO/BiFeO 3 heterostructures, 2 charge disproportionation in LMO/SrMnO 3 superlattices, 3 ferromagnetic coupling, and half-metallicity in LMO/SrTiO 3 (STO) heterostructures. 4 In general, the ferromagnetic state, paramagnetic state, and antiferromagnetic state are known as the conventional magnetic states in magnetic materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Strain-Induced Cluster Glass State in LaMnO₃ Films

et al. 2019

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Strain effect has great influence on the magnetic properties of manganite films. Here, we report a new phenomenon in which the biaxial tensile strain can induce the formation of the cluster glass state in LaMnO3 (LMO) films. By comparing the properties of the LMO films grown on the LaAlO3, SrTiO3, and MgO substrates, the mechanism of the formation of the cluster glass state in LMO films was investigated in depth. We demonstrate that the formation of the cluster glass state in LMO films is due to the biaxial tensile strain, which leads to the competition between ferromagnetic and antiferromagnetic interactions by changing the percentage of Mn3+ and Mn4+ ions in the films. Our work demonstrates that strain is an important factor in the formation of the cluster glass state in manganite films.

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Charge disproportionation of Mn 3d and O 2p electronic states depending on strength of p−d hybridization in

Cited by 8 publications

References 30 publications

Tunable Collective Excitations in Epitaxial Perovskite Nickelates

Tunable Collective Excitations in Epitaxial Perovskite Nickelates

Persistent half-metallic ferromagnetism in a (111)-oriented manganite superlattice

Strain-Induced Cluster Glass State in LaMnO₃ Films

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Charge disproportionation of Mn 3d and O 2p electronic states depending on strength of p−d hybridization in

Cited by 8 publications

References 30 publications

Tunable Collective Excitations in Epitaxial Perovskite Nickelates

Tunable Collective Excitations in Epitaxial Perovskite Nickelates

Persistent half-metallic ferromagnetism in a (111)-oriented manganite superlattice

Strain-Induced Cluster Glass State in LaMnO3 Films

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Product

Resources

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Strain-Induced Cluster Glass State in LaMnO₃ Films