  We report the experimental and theoretical study on magnetic nature of Bi3Ni
system. The structure is found to be orthorhombic (Pnma) with lattice
parameters a = 8.879{\AA} b = 4.0998{\AA} and c = 4.099{\AA}. The title
compound is synthesized via a solid state reaction route by quartz vacuum
encapsulation of 5N purity stoichiometric ingredients of Ni and Bi. The
superconducting transition temperature is found to be 4.1 K as confirmed from
magnetization and specific heat measurements. The lower critical field (Hc1)
and irreversibility field (Hirr) are around 150 and 3000Oe respectively at 2K.
Upper critical field (Hc2) as determined from in field (up to 4 Tesla) ac
susceptibility is found to be around 2 Tesla at 2K. The normal state specific
heat is fitted using Sommerfeld-Debye equation C(T) = {\gamma}T +
{\beta}T3+{\delta}T5 and the parameters obtained are {\gamma}= 11.08mJ/mol-K2,
{\beta}= 3.73mJ/mol-K4 and {\delta}= 0.0140mJ/mol-K6. The calculated electronic
density of states (DOS) at Fermi level N(EF) and Debye temperature {\Theta}D
are 4.697 states/eV per formula unit and 127.7K respectively. We also estimated
the value of electron phonon coupling constant ({\lambda}) to be 1.23, which
when substituted in MacMillan equation gives Tc = 4.5K. Density functional
(DFT) based calculations for experimentally determined lattice parameters show
that Ni in this compound is non-magnetic and ferromagnetic interactions seem to
play no role. The Stoner condition I*N(EF) = 0.136 per Ni atom also indicates
that system cannot have any ferromagnetism. The fixed spin moment (FSM)
calculations by fixing total magnetic moment on the unit cell also suggested
that this system does not exhibit any signatures of ferromagnetism.
