Magnetic excitations in infinite-layer nickelates

Lu, Haiyu; Rossi, Mario E.; Nag, Abhishek; Osada, Motoki; Li, D.; Lee, K.; Wang, B. Y.; García-Fernández, Mirian; Agrestini, S.; Shen, Zhi‐Xun; Been, Emily; Moritz, Brian; Devereaux, T. P.; Zaanen, Jan; Hwang, Harold Y.; Zhou, Kejin; Lee, W. S.

doi:10.1126/science.abd7726

Cited by 169 publications

(131 citation statements)

References 41 publications

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“…As mentioned above, this does not seem to be the case for the infinite layer nickelates, which in bulk are paramagnetic [23,25,26]. Nonetheless, Ni L 3 -edge RIXS measurements on the superconducting films by Lu et al [48] find a magnon spectrum consistent with the spin-1/2 antiferromagnetic square lattice found in cuprates. The nearest-neighbor exchange, J 1 63 meV, is roughly half that found in copper oxide materials.…”

Section: Magnetismmentioning

confidence: 94%

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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Section: Magnetismmentioning

confidence: 94%

A Nickelate Renaissance

Mitchell

2021

Front. Phys.

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“…Recently, magnetic excitations in Nd 1−x Sr x NiO 2 have been revealed using RIXS at the Ni L 3 -edge [66]. As shown in Figure 2A, a branch of dispersive magnetic excitations has been observed in NdNiO 2 , whose energy-momentum dispersion resembles the spin wave excitations of AFM coupled spins in a square lattice.…”

Section: Magnetic Excitations In Infinite-layer Nickelatesmentioning

confidence: 94%

“…Along these lines, insights from experiments can help to resolve the controversy about similarities and differences between IL nickelates and cuprates. In particular, recent x-ray and electron energy-loss spectroscopic studies [64][65][66] unveiled a reduced Ni-O hybridization, presence of a weakly interacting RE 5d metallic band, and overdamped spin excitations with a bandwidth as large as 200 meV in IL nickelates.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Other types of order, in particular A-AFM order, are not favored. In the recent x-ray scattering experiment [36], the existence of AFM correlations was confirmed, but the small cluster size prevents us from concluding whether AFM long-range order could be stable or not in this parameter regime.…”

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confidence: 85%

Character of Doped Holes in Nd1−xSrxNiO2

et al. 2021

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We investigate charge distribution in the recently discovered high-Tc superconductors, layered nickelates. With increasing value of charge-transfer energy, we observe the expected crossover from the cuprate to the local triplet regime upon hole doping. We find that the d−p Coulomb interaction Udp makes Zhang-Rice singlets less favorable, while the amplitude of local triplets at Ni ions is enhanced. By investigating the effective two-band model with orbitals of x2−y2 and s symmetries we show that antiferromagnetic interactions dominate for electron doping. The screened interactions for the s band suggest the importance of rare-earth atoms in superconducting nickelates.

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Magnetic excitations in infinite-layer nickelates

Cited by 169 publications

References 41 publications

A Nickelate Renaissance

A Nickelate Renaissance

Soft X-Ray Spectroscopy of Low-Valence Nickelates

Character of Doped Holes in Nd1−xSrxNiO2

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