Regensburg 1998 – wissenschaftliches Programm

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SYC: Symposium Raster-Sonden-Mikroskopie und -Spektroskopie bei tiefen Temperaturen

SYC 3: Halbleiter und Hochtemperatursupraleiter

SYC 3.3: Hauptvortrag

Dienstag, 24. März 1998, 15:00–15:30, H18

Non-BCS Behavior of High Temperature Superconductors: New Evidence from Scanning Tunneling Spectroscopy — •Oystein Fischer — Département de physique de la matière condensée Université de Genève

The understanding of the mechanism and the microscopic nature of high temperature superconductivity is one of the major challenges in solid state physics today. In this presentation we shall show how the Scanning Tunneling Microscope can be used to study this problem. After an introduction to the experimental technique we shall discuss recent results on the temperature dependence of the quasi-particle density of states and its relation to the so-called pseudogap above the critical temperature. Following this we shall illustrate how the vortices in superconductors can be observed by Scanning Tunneling Spectroscopy and how the measurement of the local density of states can shine further light on the basic questions which arise in high temperature superconductors. The results clearly point towards a behavior that goes beyond the classical BCS theory.