Magnetic memory and spontaneous vortices in a van der Waals superconductor

Eylon Persky (), Anders V. Bjørlig, Irena Feldman, Avior Almoalem, Ehud Altman, Erez Berg, Itamar Kimchi, Jonathan Ruhman, Amit Kanigel and Beena Kalisky ()
Additional contact information
Eylon Persky: Bar Ilan University
Anders V. Bjørlig: Bar Ilan University
Irena Feldman: Technion–Israel Institute of Technology
Avior Almoalem: Technion–Israel Institute of Technology
Ehud Altman: University of California, Berkeley
Erez Berg: Weizmann Institute of Science
Itamar Kimchi: School of Physics, Georgia Institute of Technology
Jonathan Ruhman: Bar Ilan University
Amit Kanigel: Technion–Israel Institute of Technology
Beena Kalisky: Bar Ilan University

Nature, 2022, vol. 607, issue 7920, 692-696

Abstract: Abstract Doped Mott insulators exhibit some of the most intriguing quantum phases of matter, including quantum spin liquids, unconventional superconductors and non-Fermi liquid metals1–3. Such phases often arise when itinerant electrons are close to a Mott insulating state, and thus experience strong spatial correlations. Proximity between different layers of van der Waals heterostructures naturally realizes a platform for experimentally studying the relationship between localized, correlated electrons and itinerant electrons. Here we explore this relationship by studying the magnetic landscape of tantalum disulfide 4Hb-TaS2, which realizes an alternating stacking of a candidate spin liquid and a superconductor4. We report on a spontaneous vortex phase whose vortex density can be trained in the normal state. We show that time-reversal symmetry is broken in the normal state, indicating the presence of a magnetic phase independent of the superconductor. Notably, this phase does not generate ferromagnetic signals that are detectable using conventional techniques. We use scanning superconducting quantum interference device microscopy to show that it is incompatible with ferromagnetic ordering. The discovery of this unusual magnetic phase illustrates how combining superconductivity with a strongly correlated system can lead to unexpected physics.

Date: 2022
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DOI: 10.1038/s41586-022-04855-2

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