On the Remarkable Superconductivity of FeSe and Its Close Cousins

Journal Article · Sun Aug 23 00:00:00 EDT 2020 · Symmetry

DOI:https://doi.org/10.3390/sym12091402· OSTI ID:1650200

Kreisel, Andreas ; Hirschfeld, Peter J. ; Andersen, Brian M.

Emergent electronic phenomena in iron-based superconductors have been at the forefront of condensed matter physics for more than a decade. Much has been learned about the origins and intertwined roles of ordered phases, including nematicity, magnetism, and superconductivity, in this fascinating class of materials. In recent years, focus has been centered on the peculiar and highly unusual properties of FeSe and its close cousins. This family of materials has attracted considerable attention due to the discovery of unexpected superconducting gap structures, a wide range of superconducting critical temperatures, and evidence for nontrivial band topology, including associated spin-helical surface states and vortex-induced Majorana bound states. Here, we review superconductivity in iron chalcogenide superconductors, including bulk FeSe, doped bulk FeSe, FeTe_1–xSe_x, intercalated FeSe materials, and monolayer FeSe and FeTe_1–xSe_x on SrTiO₃. We focus on the superconducting properties, including a survey of the relevant experimental studies, and a discussion of the different proposed theoretical pairing scenarios. In the last part of the paper, we review the growing recent evidence for nontrivial topological effects in FeSe-related materials, focusing again on interesting implications for superconductivity.

• Research Organization: Univ. of Florida, Gainesville, FL (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC)
• Grant/Contract Number: FG02-05ER46236
• OSTI ID: 1650200
• Alternate ID(s): OSTI ID: 1800322
• Journal Information: Symmetry, Journal Name: Symmetry Vol. 12 Journal Issue: 9; ISSN 2073-8994
• Publisher: MDPI AG
• Country of Publication: Switzerland
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Science & Technology - Other Topics
iron-based superconductivity
unconventional superconductivity
magnetism
nematicity
superconducting pairing
strongly correlated electrons
multiband superconductivity
topological superconductivity
Majorana zero modes