Theory of high-temperature superconductivity in underdoped cuprates; the unusual electronic structure and the origin of the pseudogap

1998 ◽  
Vol 10 (49) ◽  
pp. 11345-11364 ◽  
Author(s):  
Hiroshi Kamimura ◽  
Kazushi Nomura ◽  
Akihiro Sano
Keyword(s):  
Electronic Structure ◽  
High Temperature ◽  
High Temperature Superconductivity ◽  
Underdoped Cuprates

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.

scholarly journals Fluctuations and the Higgs Mechanism in Underdoped Cuprates

2020 ◽  
Vol 11 (1) ◽  
pp. 301-323 ◽  
Author(s):  
C. Pépin ◽  
D. Chakraborty ◽  
M. Grandadam ◽  
S. Sarkar
Keyword(s):  
High Temperature ◽  
Cuprate Superconductors ◽  
High Temperature Superconductivity ◽  
Higgs Mechanism ◽  
Pseudogap Phase ◽  
Theoretical Approaches ◽  
Underdoped Region ◽  
Underdoped Cuprates ◽  
The Rich ◽  
Ubiquitous Presence

The physics of the pseudogap phase of high-temperature cuprate superconductors has been an enduring mystery over the past 30 years. The ubiquitous presence of the pseudogap phase in underdoped cuprates suggests that understanding it is key to unraveling the origin of high-temperature superconductivity. We review various theoretical approaches to this problem, emphasizing the concept of emergent symmetries in the underdoped region of those compounds. We differentiate these theories by considering a few fundamental questions related to the rich phenomenology of these materials. Lastly, we discuss a recent idea regarding two kinds of entangled preformed pairs that open a gap at the pseudogap onset temperature, T*, through a specific Higgs mechanism. We review the experimental consequences of this line of thought.

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