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Effect of Sr Doping on Structural and Transport Properties of Bi2Te3
Authors:Yurii G. Selivanov  Victor P. Martovitskii  Mikhail I. Bannikov  Aleksandr Y. Kuntsevich
Affiliation:P.N. Lebedev Physical Institute of the RAS, 119991 Moscow, Russia; (V.P.M.); (M.I.B.)
Abstract:
Search for doped superconducting topological insulators is of prime importance for new quantum technologies. We report on fabrication of Sr-doped Bi2Te3 single crystals. We found that Bridgman grown samples have p-type conductivity in the low 1019 cm3, high mobility of 4000 cm2V1s1, crystal structure independent on nominal dopant content, and no signs of superconductivity. We also studied molecular beam epitaxy grown SrxBi2xTe3 films on lattice matched (1 1 1) BaF2 polar surface. Contrary to the bulk crystals thin films have n-type conductivity. Carrier concentration, mobility and c-lattice constant demonstrate pronounced dependence on Sr concentration x. Variation of the parameters did not lead to superconductivity. We revealed, that transport and structural parameters are governed by Sr dopants incorporation in randomly inserted Bi bilayers into the parent matrix. Thus, our data shed light on the structural position of dopant in Bi2Te3 and should be helpful for further design of topological insulator-based superconductors.
Keywords:topological insulator   topological superconductivity   doping   thin films   molecular beam epitaxy   single crystals
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