Magnetic and Electronic Transport Properties of Large Crystallite Disorientation Angle Interfaces of a Bi-Sb 3d Topological Insulator

Abstract

We present results of a study of the magnetic and galvanomagnetic properties of Bi1-xSbx (0.07 < x < 0.2) bicrystals in a temperature range of 1.6-100 K using a Quantum Design SQUID magnetometer and a Physical Property Measuring System (PPMS) with a 140-kOe induction magnet. The quantum oscillations of galvanomagnetic effects were registered in stationary (up to 180 kOe) and pulse magnetic fields (up to 400 kOe) directed along the C3 axis of the crystallites. The studied bicrystals consisting of two single crystalline blocks (crystallites) and the perfect superconducting nano-width crystallite interfaces with a solitary central part (thickness of about 60 nm) and two similar adjacent layers (~20 nm) on both sides of it were prepared by the horizontal zone recrystallization method.