We have studied the electronic properties of Bi 2 Te 3 〈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 Bi 2 Te 3 〈Cu〉 revealed additional series of oscillations for H ⊥ C ⊥ I . We observed magnetoresistance oscillations at temperatures from 240 to 280 K, due to the magnetophonon resonance. The magnetophonon oscillations in self-intercalated Bi 2 Te 3 〈Cu〉 are periodic and better defined in comparison with copper-intercalated Bi 2 Te 3 .
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С. Ш. Кахраманов (2008) studied this question.