Weak Anti-localization Effect and Study of De-phasing Mechanism in Bi0.95Sb0.05 Topological Single Crystal

Here, we report the growth and magneto-transport studies of Bi0.95Sb0.05 single crystal synthesized by the self-flux method. The phase is confirmed through powder X-ray diffraction. The magneto-transport studies of Bi0.95Sb0.05 single crystal at 2 K temperature show a huge magneto-resistance (MR) ≈ 1300% in a magnetic field of 6 T. Interestingly, signatures of weak anti-localization (WAL) effect are seen near-zero fields. The physical parameters characterizing the WAL effect are calculated using the Hikami-Larkin-Nagaoka (HLN) model. The obtained pre-factor (α) value indicated contributions from more than one conduction channel in magneto-conductivity in low field regime. A field-dependent quadratic (quantum scattering term) and linear (bulk contribution) terms are added to HLN to study the effect of temperature and applied magnetic field on conduction mechanism. Coming to the phase coherence dependence on temperature, the de-phasing mechanism in Bi0.95Sb0.05 single crystal is found to be governed by both electron-electron scattering and electron-phonon scattering. This article gives a clear sign of WAL at low fields and non-saturating linear magneto-resistance (LMR) at higher fields in Bi0.95Sb0.05 single crystal, which are governed by multi-scattering mechanism.