Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.6: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Superconductivity in [(SnSe)1+δ]m[NbSe2]n ferecrystals — •Olivio Chiatti1, Klara Mihov1, Martina Trahms1, Theodor Griffin1, Corinna Grosse1, Danielle Hamann2, Kyle Hite2, Matty B. Alemayehu2, David C. Johnson2, and Saskia F. Fischer11Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Solid State Chemistry, Inorganic Chemistry, Electrochemistry and Materials Science, University of Oregon, Eugene, OR 97403-1253, U.S.A.

The electrical properties of layered superconducting thin films have recently received a lot of attention. The ferecrystals are multilayers grown with atomic layer precision, but without an epitaxial relationship between the layers in growth direction. In this work, the ferecrystals are composed of a superconducting transition metal dichalgonide (NbSe2) stacked repeatedly with a metal monochalgogenide (SnSe), which provides a model system for layered superconductors [1]. We examine ferecrystals with n=1 and varying m, which show a superconducting phase below a critical temperature. The Ginzburg-Landau coherence lengths are determined from the critical magnetic fields and give information about the coupling between the superconducting NbSe2 monolayers [2]. In addition, we discuss the conductivity corrections above the critical temperature due to quantum effects and superconducting fluctuations.
 [1] C. Grosse et al., Cryst. Res. Technol. 52, 1700126 (2017)
 [2] M. Trahms et al., Supercond. Sci. Technol. 31, 065006 (2018)

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