Hidden magnetic memory and spontaneous superconducting vortices in alternating stacking compound 4Hb-TaS₂

Van der Waals heterostructures provide a unique opportunity to examine proximity effects between materials with vastly different ground states. 4Hb-TaS2 naturally realizes this opportunity as its structure is an alternate stacking of two lattice structures, 1T and 1H, a candidate spin liquid and a superconductor. In my talk, I will show scanning superconducting quantum interference device (SQUID) data, mapping the magnetic landscape of this compound. The data reveal hidden magnetic memory in the normal state which affects the superconducting state. Our results indicate an unconventional interplay between time reversal symmetry breaking and superconductivity in this compound.