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Iron pnictides and chalcogenides: a new paradigm for superconductivity
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Iron pnictides and chalcogenides: a new paradigm for superconductivity
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Journal Article
Iron pnictides and chalcogenides: a new paradigm for superconductivity
2022
Overview
Superconductivity is a remarkably widespread phenomenon that is observed in most metals cooled to very low temperatures. The ubiquity of such conventional superconductors, and the wide range of associated critical temperatures, is readily understood in terms of the well-known Bardeen–Cooper–Schrieffer theory. Occasionally, however, unconventional superconductors are found, such as the iron-based materials, which extend and defy this understanding in unexpected ways. In the case of the iron-based superconductors, this includes the different ways in which the presence of multiple atomic orbitals can manifest in unconventional superconductivity, giving rise to a rich landscape of gap structures that share the same dominant pairing mechanism. In addition, these materials have also led to insights into the unusual metallic state governed by the Hund’s interaction, the control and mechanisms of electronic nematicity, the impact of magnetic fluctuations and quantum criticality, and the importance of topology in correlated states. Over the fourteen years since their discovery, iron-based superconductors have proven to be a testing ground for the development of novel experimental tools and theoretical approaches, both of which have extensively influenced the wider field of quantum materials.
The progress and the outstanding issues in understanding the correlated phases in the unconventional iron-based superconductors is reviewed.
Publisher
Nature Publishing Group UK,Nature Publishing Group
