Soft X-Ray Spectroscopy of Low-Valence Nickelates

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...

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Bibliographic Details
Published inFrontiers in physics Vol. 9
Main Authors Hepting, Matthias, Dean, Mark P. M., Lee, Wei-Sheng
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media SA 22.12.2021
Frontiers Media S.A
Subjects
infinite-layer nickelates
low-valence nickelates
RIXS
spectroscopy
trilayer nickelates
XAS
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Summary: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.
Bibliography:USDOE
AC02-76SF00515 DE-SC0012704
ISSN:2296-424X
2296-424X
DOI:10.3389/fphy.2021.808683