Scanning Tunneling Spectroscopy on High Temperature Superconductors

摘要: The discovery of the high temperature superconductors in 1986 radically changed situation field superconductivity. Not only did critical increase drastically, but it becomes more and clear that nature superconducting state is different from one found well known low superconductors. In spite a considerable world wide effort to study these new we still do not know origin pairing interaction. It remains central challenges solid physics today elucidate this mechanism. One essential ingredient quest for an understanding quasiparticle density states or other words single particle excitations above ground state. 1960 Ivar Giaever 2 demonstrated tunneling between superconductor normal metal allowed direct measurement superconductor. After path breaking work, became main tool investigating various materials at time. particular inversion scheme developed by Rowell McMillan extract electron phonon coupling spectra made quantitative verification BCS model possible. Since superconductors, numerous investigations have been carried out with hope such studies will finally allow unravel mechanisms leading