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Role of Se vacancies on Shubnikov de Haas oscillations in Bi2Se3: a combined magneto-resistance and positron annihilation study

Magneto resistance measurements coupled with positron lifetime measurements, to characterize the vacancy type defects, have been carried out on the topological insulator (TI) system Bi2Se3, of varying Se/Bi ratio. Pronounced Shubnikov de Haas (SdH) oscillations are seen in nominal Bi2Se3.1 crystals for measurements performed in magnetic fields up to 15 T in the 4 K to 10 K temperature range, with field applied perpendicular to the (001) plane of the crystal. The quantum oscillations, characteristic of 2D electronic structure, are seen only in the crystals that have a lower concentration of Se vacancies, as inferred from positron annihilation spectroscopy.

preprint2014arXivOpen access
T. R. DevidasE. P. AmaladassShilpam SharmaR. RajaramanD. SornaduraiN. SubramanianAwadhesh ManiC. S. SundarA. Bharathi
cond-mat.mtrl-sci
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T. R. DevidasE. P. AmaladassShilpam SharmaR. RajaramanD. SornaduraiN. SubramanianAwadhesh ManiC. S. SundarA. Bharathi

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