The electronic structure and properties of high-temperature superconductivity at high doping levels

1990 ◽  
Author(s):  
D. I. Khomskii
Keyword(s):  
Electronic Structure ◽  
High Temperature ◽  
High Temperature Superconductivity ◽  
Structure And Properties

scholarly journals Soft X-Ray Spectroscopy of Low-Valence Nickelates

2021 ◽  
Vol 9 ◽  
Author(s):  
Matthias Hepting ◽  
Mark P. M. Dean ◽  
Wei-Sheng Lee
Keyword(s):  
Electronic Structure ◽  
High Temperature ◽  
High Temperature Superconductivity ◽  
Essential Elements ◽  
X Ray ◽  
Infinite Layer ◽  
X Ray Scattering ◽  
The Subject ◽  
X Ray Absorption ◽  
Degree Of Similarity

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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