  We report herein the successful synthesis of the topological material
SnBi2Te4 in single-crystal form. Phase purity and unidirectional growth are
evident from X-ray diffraction (XRD) patterns acquired from a powdered sample
and a crystal flake. The crystalline morphology has also been visualized by
acquiring a field-emission scanning electron microscope (FESEM) image. The
crystal has been thoroughly characterized by means of Raman spectroscopy and X
ray photoelectron spectroscopy (XPS) measurements. The topological properties
of SnBi2Te4 have been probed through magneto-transport measurements. SnBi2Te4
has been found to exhibit a small but non-saturating magneto-resistance (MR) up
to 12 T. The low-field magnetoconductivity (MC) of SnBi2Te4 at 2 K can be well
explained through the Hikami Larkin Nagaoka (HLN) formalism, which confirms the
presence of a weak anti-localization (WAL) effect in its crystal. Moreover, the
non-trivial topological character has been evidenced through first-principles
calculations using density functional theory (DFT), with and without spin-orbit
coupling (SOC) protocols. A significant change in the bulk electronic band
structure is observed upon the inclusion of SOC parameters, signifying the
topological properties of SnBi2Te4. Its topological non-trivial character has
also been verified through the calculation of Z2 invariants and the surface
states spectrum in the (111) plane.
