Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.4: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Growth and characterization of high-quality Tl2Mo6Se6 crystals and nanowires — •Yongjian Wang, Mengmeng Bai, Mahasweta Bagchi, Zhiwei Wang, and Yoichi Ando — Institute of Physics II, University of Cologne, D-50937 Cologne, Germany
Topological superconductor (TSC) has attracted extensive interest because of its potential application to topological quantum computation, which is based on Majorana fermion (MF). Recently, the long-existed quasi-one-dimensional superconductor, Tl2Mo6Se6, was predicted to be a new TSC [1]. Here we report the growth and characterizations of high-quality superconducting Tl2Mo6Se6 crystals and nanowires. Fiber-shaped crystals with typical size of 0.3×0.3×10 mm3 were grown by reacting the starting raw materials in a quartz tube. The highest critical temperature (Tc) was observed to be 6.7 K from both resistivity and magnetic susceptibility measurements. The highest shielding fraction was estimated to be 100%. The upper critical field (Hc2) behaviour shows an upturn with lowering temperature, which is similar to the results reported before [2], suggesting unconventional superconductivity. Tl2Mo6Se6 nanowires with typical diameter of 100 nm were obtained by exfoliating Tl2Mo6Se6 crystals, which were used for fabricating devices by e-beam lithography for transport measurements. Superconductivity with Tc up to 6 K was observed.
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