Spectroscopic and spatial characterization of superconducting vortex core states with a scanning tunneling microscope

摘要: The Abrikosov flux lattice and individual superconducting vortices are imaged with a low temperature scanning tunneling microscope. Differential conductance measurements taken while allow one to image the quasiparticle wavefunctions. Different energy states highlighted by at different dc voltages. States which bound vortex core voltage below gap energy. lowest wavefunctions exist fermi level show radial extent of about coherence length, higher display more extended wavefunction. Likewise scattering can be voltages above gap. results interpreted within context Bardeen–Cooper–Schrieffer theory.