Observation of Superconductivity Induced Ferromagnetism in an Fe-Chalcogenide Superconductor

Abstract

The interplay among topology, superconductivity, and magnetism promises to bring a plethora of exotic and unintuitive behaviors in emergent quantum materials. The family of Fe-chalcogenide superconductors FeTexSe1-x are directly relevant in this context due to their intrinsic topological band structure, high-temperature superconductivity, and unconventional pairing symmetry. Despite enormous promise and expectation, the local magnetic properties of FeTexSe1-x remain largely unexplored, which prevents a comprehensive understanding of their underlying material properties. Exploiting nitrogen vacancy (NV) centers in diamond, here we report nanoscale quantum sensing and imaging of magnetic flux generated by exfoliated FeTexSe1-x flakes, providing clear evidence of superconductivity-induced ferromagnetism in FeTexSe1-x. The coexistence of superconductivity and ferromagnetism in an established topological superconductor opens up new opportunities for exploring exotic spin and charge transport phenomena in quantum materials. The demonstrated coupling between NV centers and FeTexSe1-x may also find applications in developing hybrid architectures for next-generation, solid-state-based quantum information technologies.

arXiv comment12 pages, 4 figures

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• High quality Fe1+yTe synthesized by chemical vapor deposition with conspicuous vortex flow
• Widefield quantum microscopy with nitrogen-vacancy centers in diamond: strengths, limitations, and prospects
• Studying Critical Parameters of Superconductor via Diamond Quantum Sensors
• Widefield NV Magnetic Field Reconstruction for Probing the Meissner Effect and Critical Current Density under Pressure
• In-situ local imaging of ferromagnetism and superconductivity in RbEuFe${}_4$As${}_4$
• Nanodiamond Sensing of Stray Fields during Domain Reversal
• Optically induced static magnetic field in ensemble of nitrogen-vacancy centers in diamond
• Potentiometric detection of spin polarization expected at the surface of FeTe0.6Se0.4 in the effective p-wave superconducting state