Enhanced spin-ordering temperature in ultrathin FeTe films grown on a topological insulator
Enhanced spin-ordering temperature in ultrathin FeTe films grown on a topological insulator
复制标题
DOI：
10.1103/physrevb.97.144513
复制
发表时间：
2017-11
影响因子：
3.7
通讯作者：
U. R. Singh;J. Warmuth;A. Kamlapure;L. Cornils;M. Bremholm;P. Hofmann;J. Wiebe;R. Wiesendanger
中科院分区：
文献类型：
--
作者：
U. R. Singh;J. Warmuth;A. Kamlapure;L. Cornils;M. Bremholm;P. Hofmann;J. Wiebe;R. Wiesendanger
We studied the temperature dependence of the diagonal double-stripe spin order in 1 and 2 unit cell thick layers of FeTe grown on the topological insulator $\mathrm{B}{\mathrm{i}}_{2}\mathrm{T}{\mathrm{e}}_{3}$ via spin-polarized scanning tunneling microscopy. The spin order persists up to temperatures which are higher than the transition temperature reported for bulk $\mathrm{F}{\mathrm{e}}_{1+y}\mathrm{Te}$ with lowest possible excess Fe content $y$. The enhanced spin order stability is assigned to a strongly decreased $y$ with respect to the lowest values achievable in bulk crystal growth, and effects due to the interface between the FeTe and the topological insulator. The result is relevant for understanding the recent observation of a coexistence of superconducting correlations and spin order in this system.
We studied the temperature dependence of the diagonal double-stripe spin order in 1 and 2 unit cell thick layers of FeTe grown on the topological insulator $\mathrm{B}{\mathrm{i}}_{2}\mathrm{T}{\mathrm{e}}_{3}$ via spin-polarized scanning tunneling microscopy. The spin order persists up to temperatures which are higher than the transition temperature reported for bulk $\mathrm{F}{\mathrm{e}}_{1+y}\mathrm{Te}$ with lowest possible excess Fe content $y$. The enhanced spin order stability is assigned to a strongly decreased $y$ with respect to the lowest values achievable in bulk crystal growth, and effects due to the interface between the FeTe and the topological insulator. The result is relevant for understanding the recent observation of a coexistence of superconducting correlations and spin order in this system.