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TT: Fachverband Tiefe Temperaturen
TT 21: Focus Session: Strongly Disordered Superconductors
TT 21.6: Talk
Tuesday, March 19, 2024, 12:15–12:30, H 0104
Temperature-Dependent Vortex Dynamics and Current Limitations in a [(SnSe)(1+δ)]3[NbSe2 ]1 Ferecrystal — •Linus P. Grote1, Wieland G. Stoffel1, Mahni Müller1, Theodor U. Griffin1, Olivio Chiatti1, Danielle Hamann2, David C. Johnson2, and Saskia F. Fischer1,3 — 1Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Department of Chemistry and Materials Science Institute, University of Oregon, Eugene OR 97403, USA — 3Center for the Science of Materials Berlin, 12489 Berlin, Germany
The evidence of two-dimensional superconductivity in van der Waals superlattices has recently received a lot of attention [1]. Our study investigates the temperature, magnetic field, and current-dependent superconducting properties of a ferecrystal - a layered van der Waals heterostructure with NbSe2 monolayers separated by SnSe spacers [2]. Current-voltage characteristics indicate a Berezinskii-Kosterlitz-Thouless phase transition and suggest two-dimensional superconductivity, while an intermediate temperature range exhibits phase slip lines and reduced critical currents. Magnetic field measurements reveal the nature of phase slip lines and determine the in-plane and out-of-plane Ginsburg-Landau coherence lenghts. Our findings contribute insights into the complex interplay of vortex behavior and superconducting properties in superconducting heterostructures, enhancing understanding of superconductor current limitations.
[1] A. Devarakonda et al., Science 370 (2020) 231
[2] O. Chiatti et al., J. Phys.: Condens. Matter 35 (2023) 215701
Keywords: Transition metal dichalcogenides; Superconductivity; BKT transition; Phase slips; van der Waals superlattices