High field (up to 140 kOe) angle dependent magneto transport of Bi2Te3 single crystals

We report the angle dependent high field (up to 140 kOe) magneto transport of Bi2Te3 single crystals, a well-known topological insulator. The crystals were grown from melt of constituent elements via solid state reaction route by self-flux method. Details of crystal growth along with their brief characterisation up to 5 Tesla applied field was reported by some of us recently (Sultana et al 2017 J. Magn. Magn. Mater. 428 213). The angle dependence of the magneto-resistance (MR) of Bi2Te3 follows the cos (theta) function i.e., MR is responsive, when the applied field is perpendicular (tilt angle theta = 0 degrees and/or 180 degrees) to the transport current. The low field (+/- 10 kOe) MR showed the signatures of weak anti localisation character with typical nu-type cusp near origin at 5 K. Further, the MR is linear right up to highest applied field of 140 kOe. The large positive MR are observed up to high temperatures and are above 250% and 150% at 140 kOe in perpendicular fields at 50 K and 100 K respectively. Heat capacity C-P (T) measurements revealed the value of Debye temperature ((sic)D) to be 135 K. Angle resolved photoemission spectroscopy data clearly showed that the bulk Bi2Te3 single crystal consists of a single Dirac cone.