Anomalous high-magnetic field electronic state of the nematic superconductors FeSe${}_{1-x}$S${}_x$

Abstract

Understanding superconductivity requires detailed knowledge of the normal electronic state from which it emerges. A nematic electronic state that breaks the rotational symmetry of the lattice can potentially promote unique scattering relevant for superconductivity. Here, we investigate the normal transport of superconducting FeSe${}_{1-x}$S${}_x$ across a nematic phase transition using high magnetic fields up to 69 T to establish the temperature and field-dependencies. We find that the nematic state is an anomalous non-Fermi liquid, dominated by a linear resistivity at low temperatures that can transform into a Fermi liquid, depending on the composition $x$ and the impurity level. Near the nematic end point, we find an extended temperature regime with $T^{1.5}$ resistivity. The transverse magnetoresistance inside the nematic phase has as a $H^{1.55}$ dependence over a large magnetic field range and it displays an unusual peak at low temperatures inside the nematic phase. Our study reveals anomalous transport inside the nematic phase, driven by the subtle interplay between the changes in the electronic structure of a multi-band system and the unusual scattering processes affected by large magnetic fields and disorder

arXiv comment18 pages, 14 figures

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Cited by in corpus (21)

• Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Strain-tuning of nematicity and superconductivity in single crystals of FeSe
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• Specific Heat of a Quantum Critical Metal
• DC resistivity near a nematic quantum critical point: Effects of weak disorder and acoustic phonons
• Multi-band description of the upper critical field of bulk FeSe
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• Robust superconductivity and fragile magnetism induced by the strong Cu impurity scattering in the high-pressure phase of FeSe
• Unveiling the quasiparticle behaviour in the pressure-induced high-$T_c$ phase of an iron-chalcogenide superconductor
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