Imaging quantum materials with scanning SQUID microscopy

Date: 
Tue, 04/01/202212:15
Location: 
Seminar Hall, Los Angeles Building, entrance floor

bina Prof. Beena Kalisky

Department of Physics and BINA Institute of Nanotechnology and Advanced Materials, Bar-Ilan University

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Competition or cooperation between different electronic orders with similar energy scales often 
gives rise to new or unexpected behaviors. Detecting traces of such orders requires versatile 
probes, which can probe different aspects of the system, such as conductivity, superconductivity 
and magnetism. In my talk, I will describe two systems where our local view uncovered 
surprising mesoscopic effects. In the oxide interface LaAlO3/SrTiO3, we imaged the current flow 
close to a metal-insulator transition. I will show that the critical behavior is controlled by 
structural domain patterns in the substrate, rather than by universal scaling laws. In the transition 
metal dichalcogenide 4Hb-TaS2 we show that the superconducting state hosts a spontaneous 
vortex phase, where vortices appear in the absence of an external field. I will show evidence that 
this spontaneous vortex phase is caused by unconventional magnetism in the normal state