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TT: Fachverband Tiefe Temperaturen
TT 28: Poster Session: Topological Topics
TT 28.2: Poster
Monday, March 12, 2018, 15:00–19:00, Poster B
Structure-Property Investigation of Superconductivity in Nb-doped Bi2Se3 — •Simone Munkholm Kevy1, Laura Wollesen1, Henriette Elisabeth Lund2, Philip Hofmann2, and Martin Bremholm1 — 1Department of Chemistry and iNano, Aarhus University, 8000 Aarhus C, Denmark — 2Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhuc C, Denmark
Topological insulators (TI) have over the past decade been studied extensively due to their interesting electronic properties that make them excellent candidates for applications in quantum computing. Bi2Se3 is a highly studied TI and a large number of studies have investigated the effects of doping. Of particular interest, doping of Bi2Se3 with Cu, Sr or Nb, leads to bulk superconductivity while the topological surface states remain intact [1-3].
In the present study, high quality crystals grown by a melt growth quench technique were investigated to reveal structure-property relations of doped Bi2Se3. The crystal growth conditions were explored to determine optimal growth conditions. The crystal NbxBi2Se3 growth by slow cooling produces compositional gradients and the as-grown crystal boules contains secondary phases that affects the elemental composition and thus the physical properties. Crystallographic studies are combined with property measurements to provide a detailed structural understanding of superconductivity in doped Bi2Se3.
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