Self-intercalation in Bi2Te3 < Cu >

We have studied the electronic properties of Bi2Te3 < Cu > crystals. The results indicate that, during natural growth and subsequent self-intercalation, copper layers are formed between Te(I)-Te(I) layers in the basal plane (0001). On cleaved (0001) surfaces, quasi-two-dimensional layers with islands were found. Studies of Shubnikov-de Haas-like 4.2-K magnetoresistance oscillations in Bi2Te3 < Cu > revealed additional series of oscillations for H perpendicular to C perpendicular to I. We observed magnetoresistance oscillations at temperatures from 240 to 280 K, due to the magnetophonon resonance. The magnetophonon oscillations in self-intercalated Bi2Te3 < Cu > are periodic and better defined in comparison with copper-intercalated Bi2Te3.