Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Superconductivity: Properties and Electronic Structure
TT 6.1: Vortrag
Montag, 7. März 2016, 10:00–10:15, H19
Superconductivity in intercalated topological insulator TlxBi2Te3 — •zhiwei wang1,2, alexey a. taskin1,2, and yoichi ando1,2 — 1Institute of Physics II, University of Cologne, D-50937 Cologne, Germany — 2Institute of Scientic and Industrial Research, Osaka University, Osaka 567-0047, Japan
Bulk superconductivity has been discovered in TlxBi2Te3, which is derived from the topological insulator Bi2Te3 by intercalating Tl. The superconducting volume fraction of up to 95% (determined from specific heat) with Tc of 2.28 K is obtained for samples with x = 0.6, where the carriers are p-type with the density of ∼1.8 × 1020 cm−3. The thermodynamic upper critical field Bc2 obtained from specific heat presents a conventional temperature dependence with the zero-temperature-limit value of 1.06 T; however, resistive transitions under magnetic fields suggests a higher Bc2, which hints at an unconventional nature of the superconductivity. The temperature dependence of the specific heat in 0 T suggests that the superconducting state is fully gapped. This material is an interesting candidate of a topological superconductor which may be realized by the strong spin-orbit coupling inherent to topological insulators.