Effect of Sr Doping on Structural and Transport Properties of Bi2Te3

被引：1

作者：

Selivanov, Yurii G. ^{[1
]}

Martovitskii, Victor P. ^{[1
]}

Bannikov, Mikhail I. ^{[1
]}

Kuntsevich, Aleksandr Y. ^{[1
]}

机构：

[1] RAS, PN Lebedev Phys Inst, Moscow 119991, Russia

来源：

MATERIALS | 2021年 / 14卷 / 24期

基金：

俄罗斯科学基金会;

关键词：

topological insulator; topological superconductivity; doping; thin films; molecular beam epitaxy; single crystals; SUPERCONDUCTIVITY; GROWTH; FILMS;

D O I：

10.3390/ma14247528

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 10(19) cm(-3), high mobility of 4000 cm(2)V(-1)s(-1), crystal structure independent on nominal dopant content, and no signs of superconductivity. We also studied molecular beam epitaxy grown SrxBi2-xTe3 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.

引用

页数：14

共 47 条

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