Strong Superexchange in a 
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 Nickelate Revealed by Resonant Inelastic X-Ray Scattering

Lin, Jun-Fa; Arribi, Pablo Villar; Fabbris, G.; Botana, Antía S.; Meyers, D.; Miao, H.; Shen, Yao; Mazzone, D. G.; Feng, Jiatai; Chiuzbăian, S. G.; Nag, Abhishek; Walters, A. C.; García-Fernández, Mirian; Zhou, Kejin; Pelliciari, Jonathan; Jarrige, Ignace; Freeland, J. W.; Zhang, Junjie; Mitchell, J. F.; Bisogni, Valentina; Liu, X.; Norman, M. R.; Dean, Mark

doi:10.1103/physrevlett.126.087001

Cited by 68 publications

(49 citation statements)

References 71 publications

(68 reference statements)

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“…Nickelates also host both superconductivity and stripe order [10][11][12], but no system has yet been shown to simultaneously host both orders. The existence of stripe order in La 4 Ni 3 O 8 , which appears rather similar to superconducting Nd 1−x Sr x NiO 2 [13][14][15][16], does, however, support the likely proximity of stripe order and superconductivity. While static stripe order appears to suppress bulk 3D superconductivity, some researchers have suggested that stripe fluctuations may act to promote superconductivity [17][18][19].…”

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confidence: 99%

Charge Condensation and Lattice Coupling Drives Stripe Formation in Nickelates

et al. 2021

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Revealing the predominant driving force behind symmetry breaking in correlated materials is sometimes a formidable task due to the intertwined nature of different degrees of freedom. This is the case for La 2−x Sr x NiO 4þδ , in which coupled incommensurate charge and spin stripes form at low temperatures. Here, we use resonant x-ray photon correlation spectroscopy to study the temporal stability and domain memory of the charge and spin stripes in La 2−x Sr x NiO 4þδ . Although spin stripes are more spatially correlated, charge stripes maintain a better temporal stability against temperature change. More intriguingly, charge order shows robust domain memory with thermal cycling up to 250 K, far above the ordering temperature. These results demonstrate the pinning of charge stripes to the lattice and that charge condensation is the predominant factor in the formation of stripe orders in nickelates.

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confidence: 99%

Charge Condensation and Lattice Coupling Drives Stripe Formation in Nickelates

et al. 2021

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“…Mark Dean's group at Brookhaven National Lab has analyzed similar experiments on single crystals of trilayer La- [3,4] and [38]. 1C, right), finding a comparable value of J 1 69 meV, although the nominal doping concentration is quite different [49]. A broadened magnon spectrum observed by this group is consistent with the spin stripes seen by neutrons.…”

Section: Magnetismmentioning

confidence: 66%

A Nickelate Renaissance

Mitchell

2021

Front. Phys.

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The 2019 discovery of high temperature superconductivity in layered nickelate films, Nd1-xSrNiO2, has galvanized a community that has been studying nickelates for more than 30 years both as cuprate analogs and in their own right. On the surface, infinite layer nickelates, and their multilayer analogs, should be promising candidates based on our understanding of cuprates: square planar coordination and a parent d9 configuration that places a single hole in a dx2-y2 planar orbital makes nickelates seem poised for superconductivity. But creating crystals and films of sufficient quality of this d9 configuration in Ni1+ has proven to be a synthetic challenge, only recently overcome. These crystalline specimens are opening windows that shed new light on the cuprate-nickelate analogy and reveal nuances that leave the relationship between cuprates and nickelates very much an area open to debate. This Perspective gives a qualitative, phenomenological account of these newly discovered superconductors and multilayer members of the infinite layer nickelate family. The focus is on our current understanding of electronic and magnetic properties of these materials as well as some future opportunities, explored from the viewpoint of synthetic challenges and some suggested developments in materials discovery and growth to make further progress in this rejuvenated field.

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“…This is known to originate from the charge-transfer nature of these materials, with Δ smaller than U, and O 2p states mixed with both the lower Hubbard band (LHB) and the UHB of the Cu 3d x 2 −y 2 states. A sizable pre-peak has also been observed in TL nickelates (Figure 1C), indicating mixing between O 2p and the Ni UHB [48,49]. Upon hole-doping of cuprates, spectral weight shifts from the UHB pre-peak to a lower-energy peak (Figure 1C) that is associated with transitions into the doped hole levels [70,71].…”

Section: Electronic Structurementioning

confidence: 88%

“…It was found by x-ray spectroscopy that metallic Pr 4 Ni 3 O 8 exhibits low-spin configuration and a significantly lifted orbital degeneracy, suggesting a close analogy to cuprates [48]. Notably, the close parallel between TL nickelates and cuprates was further corroborates by RIXS, revealing the presence of strong AFM exchange coupling J in La 4 Ni 3 O 8 and Pr 4 Ni 3 O 8 [49]. Nonetheless, superconductivity has not been detected in TL nickelates.…”

Section: Introductionmentioning

confidence: 93%

Soft X-Ray Spectroscopy of Low-Valence Nickelates

2021

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Low-valence nickelates—including infinite-layer (IL) and trilayer (TL) compounds—are longstanding candidates for mimicking the high-temperature superconductivity of cuprates. A recent breakthrough in the field came with the discovery of superconductivity in hole-doped IL nickelates. Yet, the degree of similarity between low-valence nickelates and cuprates is the subject of a profound debate for which soft x-ray spectroscopy experiments at the Ni L- and O K-edge provided critical input. In this review, we will discuss the essential elements of the electronic structure of low-valance nickelates revealed by x-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS). Furthermore, we will review magnetic excitations observed in the RIXS spectra of IL and TL nickelates, which exhibit characteristics that are partly reminiscent of those of cuprates.

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Strong Superexchange in a d9−δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering

Cited by 68 publications

References 71 publications

Charge Condensation and Lattice Coupling Drives Stripe Formation in Nickelates

Charge Condensation and Lattice Coupling Drives Stripe Formation in Nickelates

A Nickelate Renaissance

Soft X-Ray Spectroscopy of Low-Valence Nickelates

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