Colloquium: The unexpected properties of alkali metal iron selenide superconductors
By E. Dagotto. 2012
235 citations recorded by the source corpus.
The iron-based superconductors that contain FeAs layers as the fundamental building block in the crystal structures have been rationalized in the past using ideas based on the Fermi surface nesting of hole and electron pockets when in the presence of weak Hubbard U interactions. This approach seemed appropriate considering the small values of the magnetic moments in the parent compounds and the clear evidence based on photoemission experiments of the required electron and hole pockets. However, recent results in the context of alkali metal iron selenides, with generic chemical composition AxFe2ySe2 (A alkali metal element), have challenged those previous ideas since at particular compositions y the low-temperature ground states are insulating and display antiferromagnetic order with large iron magnetic moments. Moreover, angle-resolved photoemission studies have revealed the absence of hole pockets at the Fermi level in these materials. The present status of this exciting area of research, with the potential to alter conceptually our understanding of the ironbased superconductors, is here reviewed, covering both experimental and theoretical investigations. Other recent related developments are also briefly reviewed, such as the study of selenide two-leg ladders and the discovery of superconductivity in a single layer of FeSe. The conceptual issues considered establishedmore » for the alkali metal iron selenides, as well as several issues that still require further work, are discussed.« less
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/ce74a572c2e2e93651d58f2dbc7fceab63d32d00
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Solids, liquids, and gases under high pressure (2018, background): “The P effects on the superconducting and structural properties were later reviewed for pnictides by Stewart (2011) and the 122 family by Dagotto (2013).”