Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.5: Poster
Montag, 18. März 2024, 15:00–18:00, Poster C
Superconductivity in quasi-2D Weyl semimetal candidate trigonal PtBi2 via chemical tuning — •Soumen Ash1, Kilian Srowik1, Reza Firouzmandi1, Laura Teresa Corredor Bohorquez1, Silke Hampel1, Saicharan Aswartham1, and Bernd Büchner1,2 — 1Institute for Solid State Research, Leibniz IFW Dresden, 01069 Dresden, Germany — 2Institute of Solid State and Materials Physics, TU Dresden, 01062 Dresden, Germany
Novel quantum states like topological superconductors that host exotic excitations like Majorana fermions have stimulated intense research due to their fundamental physics and potential applications for quantum information technology. Recent discovery of sub-Kelvin superconductivity in quasi-2D Weyl semimetal candidate PtBi2 has offered a new platform to explore the effect of chemical tuning on its superconducting and topological properties. We have carried out (i) Ir doping at Pt-site, (ii) Te and Se doping at Bi-sites, and (iii) Cu intercalation into the van der Waals layers of trigonal PtBi2 via solid-state reactions and successfully grown plate-like single crystals using a stoichiometric melt growth technique. Detailed structural, electrical transport, magnetic, and thermodynamic characterizations have been conducted. Doping of chalcogen atoms at Bi-sites induces a structural phase transition from noncentrosymmetric structure (space group: P31m) to centrosymmetric structure (space group: P3m). We report superconductivity in Pt0.9Ir0.1Bi2, PtBi1.8Te0.2, PtBi1.9Se0.1, and Cu0.1PtBi2 with comparatively higher Tc ≈ 2.3 − 2.4 K. This work opens up a new avenue to get further insights into the superconductivity in trigonal PtBi2.
Keywords: Superconductivity; Quasi-2D van der Waals system; Weyl semimetal; Doping and intercalation