Unusual non saturating Giant Magneto-resistance in single crystalline Bi2Te3 topological insulator

Topological insulators (TI) are among the newest wonders in condensed matter. In fact, the ongoing research on TI has attracted huge attentionof condensed matter physics community in recent years[1–3]. Particularly, the insulating band gaps in the bulk, but the gap less high conductivityat surface or edge states had been of tremendous interest[2,4–6]. Basically, the spin of the electron gets locked with the momentum through spinorbit interaction [3]. The topological insulators had been the source of new exotic physics, whereby a band insulator exhibits good conductivity duethe topological surface states and the role of the both spin and momentum is found be important[1–6].Interestingly, enough it was soon realized in early days itself that superconducting state can also be envisaged in a topological insulator andvarious proposals were put forward for accommodation of superconductivity in topological insulators[7–11]. Precisely echoing the fact the gap lesssurface/edge conducting states could eventually be the superconducting one as well [7]. Namely to cite a few superconductivity is reported in (Cu/Sr)xBi2Se3[12–15],Tl0.6Bi2Te3[16], NbxBi2Se3[17], and PdxBi2Te3[18] etc