Soft X-Ray Spectroscopy of Low-Valence Nickelates

Hepting, Matthias; Dean, Mark P. M.; Lee, Wei-Sheng

doi:10.3389/fphy.2021.808683

Soft X-Ray Spectroscopy of Low-Valence Nickelates

Journal Article · Wed Dec 22 00:00:00 EST 2021 · Frontiers in Physics

DOI:https://doi.org/10.3389/fphy.2021.808683· OSTI ID:1839496

Hepting, Matthias; Dean, Mark P. M.; Lee, Wei-Sheng

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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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515; SC0012704

OSTI ID:: 1839496

Alternate ID(s):: OSTI ID: 1865360

Journal Information:: Frontiers in Physics, Journal Name: Frontiers in Physics Vol. 9; ISSN 2296-424X

Publisher:: Frontiers Media SACopyright Statement

Country of Publication:: Switzerland

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
RIXS
XAS
electronic structure
infinite-layer nickelates
low-valence nickelates
magnetic correlations
spectroscopy
trilayer nickelates

Soft X-Ray Spectroscopy of Low-Valence Nickelates

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