TY - JOUR

T1 - On the Remarkable Superconductivity of FeSe and Its Close Cousins

AU - Kreisel, Andreas

AU - Hirschfeld, Peter J.

AU - Andersen, Brian M.

PY - 2020/9/1

Y1 - 2020/9/1

N2 - 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, FeTe1-xSex, intercalated FeSe materials, and monolayer FeSe and FeTe1-xSex 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.

AB - 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, FeTe1-xSex, intercalated FeSe materials, and monolayer FeSe and FeTe1-xSex 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.

KW - iron-based superconductivity

KW - unconventional superconductivity

KW - magnetism

KW - nematicity

KW - superconducting pairing

KW - strongly correlated electrons

KW - multiband superconductivity

KW - topological superconductivity

KW - Majorana zero modes

KW - HIGH-TEMPERATURE SUPERCONDUCTIVITY

KW - IRON-BASED SUPERCONDUCTORS

KW - S-WAVE SUPERCONDUCTIVITY

KW - SINGLE-LAYER

KW - ELECTRONIC-STRUCTURE

KW - MAJORANA FERMIONS

KW - PHASE-DIAGRAM

KW - SPIN FLUCTUATIONS

KW - MAGNETIC ORDER

KW - CRITICAL-POINT

U2 - 10.3390/sym12091402

DO - 10.3390/sym12091402

M3 - Review

VL - 12

JO - Symmetry: Culture and Science

JF - Symmetry: Culture and Science

SN - 0865-4824

IS - 9

M1 - 1402

ER -