Emergence of an incipient ordering mode in FeSe

Abstract

The structurally simplest Fe-based superconductor FeSe with a critical temperature $T_c\approx$ 8.5 K displays a breaking of the four-fold rotational symmetry at a temperature $T_s\approx 87$ K. We investigated the electronic properties of FeSe using scanning tunneling microscopy/spectroscopy (STM/S), magnetization, and electrical transport measurements. The results indicated two new energy scales (i) $T^{\ast }\approx$ 75 K denoted by an onset of electron-hole asymmetry in STS, enhanced spin fluctuations, and increased positive magnetoresistance; (ii) $T^{\ast \ast }\approx$ 22 - 30 K, marked by opening up of a partial gap of about 8 meV in STS and a recovery of Kohler's rule. Our results reveal onset of an incipient ordering mode at $T^{\ast }$ and its nucleation below $T^{\ast \ast }$. The ordering mode observed here, both in spin as well as charge channels, suggests a coupling between the spins with charge, orbital or pocket degrees of freedom.

5 pages, 4 figures

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• Electron carriers with possible Dirac-cone-like dispersion in FeSe${}_{1-x}$S${}_x$ ($x$ = 0 and 0.14) single crystals triggered by structural transition
• Superconducting gap structure of FeSe
• Extended Kohler${}^{,}$s Rule of Magnetoresistance
• Metamorphoses of electronic structure of FeSe-based superconductors (Review article)
• Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe
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• Influence of disorder on the signature of pseudogap and multigap superconducting behavior in FeSe
• Synthesis, phase stability, structural and physical properties of 11-type iron chalcogenides
• Observation of Ising spin-nematic order and its close relationship to the superconductivity in FeSe single crystals
• Structural and electronic properties of ultrathin FeSe films grown on Bi${}_2$Se${}_3$(0001) studied by STM/STS
• Nematic state of the FeSe superconductor
• Design of a V-Ti-Ni alloy with superelastic nano-precipitates
• Anomalous Magnetotransport in the Paramagnetic State of a Magnetic Kagome Metal EuTi${}_3$Bi${}_4$
• Unusual normal and superconducting state properties observed in hydrothermal Fe1-xSe flakes
• Electronic phase diagram of iron chalcogenide superconductors FeSe1-xSx and FeSe1-yTey
• Electronic and Superconducting Properties of Some FeSe-based Single Crystals and Films Grown Hydrothermally
• In-plane and interlayer magnetoresistance in FeSe