From band reconstruction to Bogoliubov dispersion: How dz2-band enhances iron-based superconductivity
The study investigated how mechanically deforming an iron-based superconductor can enhance its superconducting pairing strength by shifting a deep dz2 electronic band toward the Fermi level. Using scanning tunneling microscopy and quasiparticle interference imaging, researchers observed this band hybridization, which resulted in a larger superconducting gap near the Fermi energy. This demonstrates that engineering correlations between deep and pairing-active bands is an effective way to optimize iron-based superconductors.