Observation of Anomalous Magnetic Moments in Superconducting Bi/Ni Bilayer

Abstract

There have been continuous efforts in searching for unconventional superconductivity over the past five decades. Compared to the well-established d-wave superconductivity in cuprates, the existence of superconductivity with other high-angular-momentum pairing symmetries is less conclusive. Bi/Ni epitaxial bilayer is a potential unconventional superconductor with broken time reversal symmetry (TRS), for that it demonstrates superconductivity and ferromagnetism simultaneously at low temperatures. We employ a specially designed superconducting quantum interference device (SQUID) to detect, on the Bi/Ni bilayer, the orbital magnetic moment which is expected if the TRS is broken. An anomalous hysteretic magnetic response has been observed in the superconducting state, providing the evidence for the existence of chiral superconducting domains in the material.

arXiv comment6 pages, 5 figures

References in corpus (13)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Long-range effects in superconductor-ferromagnet structures
• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
• Observation of half-height magnetization steps in Sr2RuO4
• Quantum Spin Fluctuations as a Source of Long-Range Proximity Effects in Diffusive Ferromagnet-Superconductor Structures
• Upper limit on spontaneous supercurrents in Sr${}_2$RuO${}_4$
• Limits on Superconductivity-Related Magnetization in Sr${}_2$RuO${}_4$ and PrOs${}_4$Sb${}_{12}$ from Scanning SQUID Microscopy
• Theory of Ferromagnetic Superconductivity
• Superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe
• Time-Reversal-Symmetry-Breaking Superconductivity in Epitaxial Bismuth/Nickel Bilayers
• Influence of the domain walls on the Josephson effect in Sr${}_2$RuO${}_4$
• Meissner phases in spin-triplet ferromagnetic superconductors

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• Nodeless bulk superconductivity in the time-reversal symmetry breaking Bi/Ni bilayer system
• Magnon-induced superconductivity in a topological insulator coupled to ferro- and antiferromagnetic insulators
• Spontaneous emergence of Josephson junctions in homogeneous rings of single-crystal Sr2RuO4
• On the Origin of Superconductivity at Nickel-Bismuth Interfaces
• Anisotropic superconductivity and elongated vortices with unusual bound states in quasi-one-dimensional nickel-bismuth compounds
• Fully-gapped superconductivity with preserved time-reversal symmetry in NiBi${}_3$ single crystals
• Absence of spontaneous time-reversal symmetry breaking and ferromagnetism in superconducting NiBi3 single crystal
• Ni/Bi bilayers: The effect of thickness on the superconducting properties
• Magnetoresistance hysteresis in the superconduting state of Kagome CsV${}_3$Sb${}_5$
• Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device