Nematicity, magnetism and superconductivity in FeSe

Abstract

Iron-based superconductors are well known for their complex interplay between structure, magnetism and superconductivity. FeSe offers a particularly fascinating example. This material has been intensely discussed because of its extended nematic phase, whose relationship with magnetism is not obvious. Superconductivity in FeSe is highly tunable, with the superconducting transition temperature, $T_{\mathrm{c}}$, ranging from 8 K in bulk single crystals at ambient pressure to almost 40 K under pressure or in intercalated systems, and to even higher temperatures in thin films. In this topical review, we present an overview of nematicity, magnetism and superconductivity, and discuss the interplay of these phases in FeSe. We focus on bulk FeSe and the effects of physical pressure and chemical substitutions as tuning parameters. The experimental results are discussed in the context of the well-studied iron-pnictide superconductors and interpretations from theoretical approaches are presented.

Topical Review submitted to Journal of Physics: Condensed Matter

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• Multiflavor Mott insulators in quantum materials and ultracold atoms
• Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• Quasiparticle Nodal Plane in the Fulde-Ferrell-Larkin-Ovchinnikov State of FeSe
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• Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe
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• Orbital-selective spin waves in detwinned NaFeAs
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• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
• Superconductivity and phase diagrams of CaK(Fe${}_{1-x}$Mn${}_x$)${}_4$As${}_4$ single crystals
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• Interplay between nematicity and Bardasis-Schrieffer modes in the short-time dynamics of unconventional superconductors
• Anomalous contribution to the nematic electronic states from the structural transition in FeSe revealed by time- and angle-resolved photoemission spectroscopy
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• Superconductivity and magnetic and transport properties of single-crystalline CaK(Fe${}_{1-x}$Cr${}_x$)${}_4$As${}_4$
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• Multipolar nematic state of nonmagnetic FeSe based on the DFT+$U$
• Nanoscale visualization of the thermally-driven evolution of antiferromagnetic domains in FeTe thin films
• Uniaxial stress effect on the electronic structure of quantum materials
• Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements
• Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates
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• Tuning Bound States of Symmetry-Breaking Vortices via Unidirectional Charge Density Wave in a Transition-Metal Dichalcogenide Superconductor
• Impact of atomic defects in the electronic states of FeSe${}_{1-x}$S${}_x$ superconducting crystals
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• The interactions between antiferromagnetism, tetrahedral sites and electron-phonon coupling in FeSe1-xTex and FeSe/SrTiO3
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• Orbitally resolved superconductivity in real space: FeSe
• Decoupled nematic and magnetic criticality in FeSe${}_{1-x}$S${}_x$
• Superconductivity near an Ising nematic quantum critical point in two dimensions
• Stripe Antiferromagnetic Ground-State Configuration of FeSe Revealed by Density Functional Theory
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