Journal
MATERIALS RESEARCH EXPRESS
Volume 9, Issue 5, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2053-1591/ac6cd0
Keywords
topological insulator; magnetoresistance; phase coherence length; Kohler's rule; Hikami-Larkin-Nagaoka model; quantum scattering
Categories
Funding
- CSIR, India
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We report experimental evidence of surface states driven magneto-transport in a Bi0.85Sb0.15 single crystal. The crystal shows non-saturating magnetoresistance and weak-anti localization effect. Further analysis reveals the presence of multiple conduction channels in the crystal.
We report, an experimental evidence of surface states (SS) driven magneto-transport in a Bi0.85Sb0.15 single crystal. Detailed high field (up to 12T) and low temperature (down to 2 K) magneto-transport measurements are been carried out on the studied Bi0.85Sb0.15 single crystal. The phase, composition and Raman modes are studied through x-ray diffraction, Energy dispersive x-ray, and Raman spectroscopy. The obtained crystal shows non-saturating magnetoresistance (approximate to 4250%) at 2 K and 12T, along with the existence of weak-anti localization (WAL) effect at around zero magnetic field. Further, the Hikami-Larkin-Nagaoka (HLN) analysis is performed to analyse the WAL effect. The prefactor (alpha) and phase coherence length (L ( phi)) are deduced at various temperatures, which signified the presence of more than one conduction channel in the studied Bi0.85Sb0.15 single crystal. The effect of quantum scattering, bulk contribution from underneath the surface states and defects are been studied by adding various field dependent quadratic, linear and constant terms to the SS driven HLN equation. Various possible scattering mechanism are studied by analysing the temperature dependence of the phase coherence length. Angle dependent magneto-conductivity of the studied Bi0.85Sb0.15 single crystal clearly confirmed the surface states dominated transport in present crystal.
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