Propriedades estruturais e magnéticas do isolante topológico Bi2Se3 com aglomerados de FexSey

Abstract

In this work, we discuss the growth of Fe containing Bi2 Se3epilayers on the GaAs(111) substrate by molecular beam epitaxy (MBE) with Fe contents of in the 8- 20% range. It is shown that Bi2 Se3 film thin are grown with quality and the Fe form a phase segregation of Fe x Sey material that may have different stoichiometries possibity, leading to magnetic and superconducting results. Despite the composite structure, the surface state of Bi2 Se3 is preserved as shown with persistence of Dirac Cone of the Γ point by Angle-Resolved Photoemission Spectroscopy (ARPES). It was observed that higher Fe content deposited is increased formation of compound responsible for ferrimagnetic layers together with the superconducting phase supposed. The Fe3Se 4 was the most abundant type of segregation in all samples, with the results ferrimagnetic these samples at temperatures around 315 K.