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The pseudogap is an elusive state that is believed to play an important role in the mechanism for high-temperature superconductivity. A torque-magnetometry study of YBCO reveals that its onset is associated with a second-order nematic transition.
The microscopic mechanism underlying an enhanced superconductivity in electron-doped iron selenide superconductor remains unclear. Here, Pan et al. report the spin excitations of Li0.8Fe0.2ODFeSe, revealing analogous momentum structure and dispersion to hole-doped cuprates.
Ultrafast vortex dynamics driven by strong currents define eletromagnetic properties of superconductors, but it remains unexplored. Here, Embon et al. use a unique scanning microscopy technique to image steady-state penetration of super-fast vortices into a superconducting Pb film at rates of tens of GHz and velocities up to tens of km/s.
Not in all superconductors do Cooper pairs respect the lattice symmetry of the crystal in which they move. Now, work finds such 'picky' Cooper pairs in the presence of strong electron–spin interaction — and gives rise to an entire host of new questions.