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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Properties and Electronic Structure I
TT 5.11: Talk
Monday, March 17, 2025, 12:15–12:30, H36
Single-crystal growth and superconducting properties of SrxBi2Se3 — •Max Brückner1, Jule Kirschke1, Fatih Cetin1, Sven Graus1, Maik Golombiewski1, Fotios Maragkos2,3, Varvara Foteinou2, Shibabrata Nandi4,5, Haneen Abushammala1, Andreas Kreyssig1, and Anna E. Böhmer1 — 1Experimentalphysik IV, Ruhr-Universität Bochum, 44801 Bochum — 2Central Unit for Ion Beams and Radionuclides, Ruhr-Universität Bochum, 44801 Bochum — 3Department of Physics, National Technical University of Athens, 15780 Athens, Greece — 4Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science and Peter Grünberg Institut, JARA-FIT, 52425 Jülich — 5Experimentalphysik IVc, JARA-FIT, RWTH Aachen, 52074 Aachen
Bi2Se3 is a topological insulator in which Sr-intercalation induces superconductivity with an unexpected two-fold anisotropy of Hc2 in the basal plane. We examine how its properties relate to different single-crystal growth conditions, including self-flux growth of free-standing single crystals from a Bi-rich melt. The Sr-content was determined by proton-induced x-ray emission spectroscopy in our as-grown crystals with a resolution of up to 30 ppm. Transport measurements in magnetic fields showed superconductivity with Tc ∼ 2-3 K at surprisingly low Sr-content. In addition, we identified SrBi2Se4 as
a secondary phase in our growth. Its superconducting properties were
found to be similar to the ones of SrxBi2Se3.
This work is supported by the ERC grant Distort-to-Grasp (No. 101040811).
Keywords: topology; high upper critical field; singe-crystal growth; Bi2Se3; Nematicity