Gossamer bulk high-temperature superconductivity in FeSe

Abstract

The cuprates and iron-based high-temperature superconductors share many common features: layered strongly anisotropic crystal structure, strong electronic correlations, interplay between different types of electronic ordering, the intrinsic spatial inhomogeneity due to doping. The understanding of complex interplay between these factors is crucial for a directed search of new high-temperature superconductors. Here we show the appearance of inhomogeneous gossamer superconductivity in bulk FeSe compound at ambient pressure and at temperature 5 times higher than its zero-resistance $T_c$. This discovery helps to understand numerous remarkable superconducting properties of FeSe. We also find and prove a general property: if inhomogeneous superconductivity in a anisotropic conductor first appears in the form of isolated superconducting islands, it reduces electric resistivity anisotropically with maximal effect along the least conducting axis. This gives a simple and very general tool to detect inhomogeneous superconductivity in anisotropic compounds, which is critically important to study the onset of high-temperature superconductivity.

10 pages, 4 figures

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• Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
• Giant superconducting fluctuations in the compensated semimetal FeSe at the BCS-BEC crossover
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• Imaging nanoscale Fermi surface variations in an inhomogeneous superconductor
• Doubling of the critical temperature of FeSe observed in point contacts

Cited by in corpus (11)

• s+is superconductivity with incipient bands: doping dependence and STM signatures
• Conductivity of anisotropic inhomogeneous superconductors above critical temperature
• The superconducting gaps in FeSe studied by soft point-contact Andreev reflection spectroscopy
• Anisotropic zero-resistance onset in organic superconductors
• On the size of superconducting islands on the density-wave background in organic metals
• Evolution of shape and volume fraction of superconducting domains with temperature and anion disorder in (TMTSF)${}_2$ClO${}_4$
• Inhomogeneous superconductivity onset in FeSe studied by transport properties
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc
• First-order phase transition between superconductivity and charge/spin-density wave as the reason of their coexistence in organic metals
• Self-consistent and Maxwell approximations to describe the excess conductivity anisotropy in FeSe above superconducting transition temperature
• Peculiar effect of sample size in layered superconductors