Unusual dependence of vortex core states on the superconducting gap in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$

B. W. Hoogenboom, K. Kadowaki, B. Revaz +3

We present a scanning tunneling spectroscopy study on quasiparticle states in vortex cores in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$. The energy of the observed vortex core states shows an…