  In this article, we report the occurrence of superconductivity in Sn0.4Sb0.6
single crystal at below 4K. Rietveld refined Powder XRD data confirms the phase
purity of as grown crystal, crystallizing in rhombohedral R-3m space group with
an elongated (2xc) unit cell in c-direction. Scanning Electron Microscope (SEM)
image and EDAX measurement confirm the laminar growth and near to desired
stoichiometry ratio. Raman Spectroscopy data shows the vibrational modes of
Sn-Sb and Sb-Sb modes at 110 and 135cm-1. ZFC (Zero-Field-Cooled) magnetization
measurements done at 10Oe showed sharp superconducting transitions at 4K along
with a minor step at 3.5K. On the other hand, Paramagnetic Meissner Effect
(PME) is observed in FC measurements. Magnetization vs applied field (M-H)
plots at 2, 2.2, 2.5, 2.7, 3, 3.2, 3.5, and 3.7K shows typical Type-II nature
of observed superconductivity with lower and upper critical fields (Hc1 and
Hc2) at 69.42Oe and 630Oe respectively at 2K. Type-II superconductivity is also
confirmed by calculated Ginzburg-Landau Kappa parameter value of 3.55.
Characteristics length viz. coherence length and penetration depth are also
calculated. Weak granular coupling is observed from R-T plot, in which
resistance is not dropping to zero down to 2K.
