Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Sample Preparation and Characterization
TT 5.7: Vortrag
Montag, 9. März 2026, 11:15–11:30, CHE/0089
Structural transition and emergent bulk superconductivity in Te-doped PtBi2 — •Soumen Ash1,2, Kilian Srowik1,2, Pablo Pedrazzini1,3, Oksana E. Kvitnitskaya1, Andrii Kuibarov1, Susmita Changdar1, Rui Lou1, Alexander Fedorov1, Swarnamayee Mishra4, Alexander Mistonov4, Saicharan Aswartham1, Jochen Geck4, Sergey Borisenko1, Laura T. Corredor1, and Bernd Büchner1,4 — 1Institute for Solid State Research, Leibniz IFW Dresden, 01069 Dresden, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 3Lab. Bajas Temperaturas, Centro Atómico Bariloche, CNEA-CONICET, 8400 San Carlos de Bariloche, Argentina — 4Institute of Solid State and Materials Physics, TU Dresden, 01062 Dresden, Germany
Noncentrosymmetric trigonal PtBi2 has emerged as a topological system exhibiting signatures of unconventional surface superconductivity, while sub-Kelvin superconductivity, as revealed by resistivity measurements, makes it a promising platform for studying chemical-tuning effects. We have carried out Te doping at the Bi sites of PtBi2 and grown plate-like crystals with nominal compositions of PtBi2−xTex (x = 0.02 - 0.05) using a stoichiometric-melt-growth method. Detailed structural, electrical transport, magnetic, thermodynamic, and spectroscopic studies reveal that doping of Te at Bi-sites results in a transition from noncentrosymmetric (space group: P31m) to centrosymmetric (space group: P3m1) crystal structure and gives rise to a bulk superconductivity with comparatively higher Tc ≈ 2.4 K.
Keywords: Superconductivity; Crystal growth; Structural transition; Chemical tuning