2025/12/09 by Hang Zhou, Zhanghai Chen, Zhou, Hang +8
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Fermion #Iron-based superconductors research #Lattice (music) #Microwave #Physics of Superconductivity and Magnetism #Signature (topology) #Superconductivity
paper · pdf · doi:10.1103/j8wg-6d9d
openalex publication_date 2026/06/11 · openalex created_date 2026/06/12 · openalex updated_date 2026/08/02
The emergence of the Abrikosov lattice in the normal phase of type-II superconducting films as the magnetic field approaches the critical field Hc2 from above was predicted in Glatz et al. [Fluctuation spectroscopy of disordered two-dimensional superconductors, Phys. Rev. B 84, 104510 (2011)PRBMDO1098-012110.1103/PhysRevB.84.104510]. In the quantum fluctuation regime [Galitski and Larkin, Superconducting fluctuations at low temperature, Phys. Rev. B 63, 174506 (2001)PRBMDO0163-182910.1103/PhysRevB.63.174506], it is characterized by the formation of relatively large (ξQF∼ξBCS/sqrt[h[over ˜]], h[over ˜]=H/Hc2-1) and long-lived (τQF∼τΔ/h[over ˜], τΔ=ℏ/Δ) clusters of rotating fluctuation Cooper pairs, representing precursors of Abrikosov vortices. We show that these fluctuation-induced vortex clusters can be detected through their high-frequency electromagnetic response. Specifically, they produce a pronounced enhancement of the imaginary part of the ac conductivity at characteristic frequencies ωQF∼h[over ˜]/τΔ, arising directly from quantum fluctuations, being well below the superconducting threshold at 2/τΔ. For niobium, ωQF falls within the experimentally accessible microwave range, making this effect directly testable using modern microwave spectroscopy.