SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Poster Session: Disordered and Granular Superconductors: Fundamentals and Applications in Quantum Technology
TT 22.5: Poster
Donnerstag, 30. September 2021, 13:30–16:00, P
Decoupling of superconducting layers in [(SnSe)1+δ]n[NbSe2]m ferecrystals — •O. Chiatti1, K. Mihov1, M. Trahms1, T. Griffin1, C. Grosse1, D. Hamann2, K. Hite2, M. B. Alemayehu2, D. C. Johnson2, and S. F. Fischer1 — 1Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Solid State Chemistry, University of Oregon, Eugene, OR 97403-1253, U.S.A.
Van-der-Waals superlattices with two-dimensional (2D) superconducting layers of a transition-metal dichalchogenide (TMD) embedded between other materials have recently received a lot of attention [1].
Embedding the TMD layers protects them from exposure to air and makes it possible to observe 2D superconductivity.
Here, we examine [(SnSe)1+δ]n[NbSe2]m ferecrystals [2] with n = 1 and varying m. The ferecrystals are stacks of polycrystalline layers grown with atomic layer precision, but without an epitaxial relationship between the layers [2].
For m ≤ 9 we observe a superconducting phase below a critical temperature, which decreases with increasing distance between the NbSe2 monolayers.
For m ≥ 9 an insulating behavior is observed.
The Ginzburg-Landau (GL) coherence lengths are determined from the upper critical magnetic fields.
The perpendicular GL coherence length decreases with increasing distance between the NbSe2 monolayers, indicating a decoupling of the superconducting layers [3].
[1] A. Devarakonda et al., Science 370, 231 (2020)
[2] C. Grosse et al., Sci. Rep. 6, 33457 (2016)
[3] M. Trahms et al., Supercond. Sci. Technol. 31, 065006 (2018)