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Quantum Materials : Jeudi 7 octobre à 14h

Beilun Wu, (Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, Universidad Autónoma de Madrid, Spain)

Zoom link:https://univ-grenoble-alpes-fr.zoom.us/j/94869917452?pwd=N1hJT3Q1dFVtV3VVOWFoQU44azlWQT09

Title: « Scanning Tunneling Microscopy at high magnetic fields magnetic fields »


In this talk, I will discuss recent advances in scanning tunneling microscopy and spectroscopy at magnetic fields of 20 T. First, I will present improvements in the instrumentation that have allowed to build compact microscopes with which we have been able to make measurements at 20 T. I will then discuss results obtained in iron pnictide superconductors. In particular, I will focus on the recent family of CaKNi4As4 materials, which has very high critical temperatures (up to 38 K) and presents isotropic two gap superconductivity. I will show measurements of the properties of the vortex lattice and of the bandstructure, the latter obtained using quasiparticle interference. I will further present recent results in the vortex phase of other iron pnictide superconductors.