  We investigate the tunability of the structural, electronic and magneto
transport properties of polycrystalline Sr2IrO4 sample. The extent of
bifurcation of the magnetisation curves during the field cooled and zero field
cooled cycles establishes that the magnetic anisotropy in the as-prepared
sample is more as compared to the vacuum annealed one. Based on the behaviours
of the structural parameters and the magnetic studies, our results show that
the canted AFM structure is stabilised in a larger temperature range in the
case of the annealed sample as compared to the as prepared one. At low
temperatures, for both the samples, a phase, possibly of glassy nature competes
with the canted AFM phase. The temperature extent to which both these phases
co-exist for the as-prepared and the annealed one is around 115K an 70K,
respectively. The transport studies reveal that for both the samples, in the
high temperature region of study, the conduction mechanism is governed by the
Arrhenius model. In the intermediate temperature range, variable range
hopping(VRH) and Arrhenius models govern the transport in the as-prepared and
the annealed one, respectively. At low temperatures, the conduction mechanism
occurs through Efros-Shklovskii-VRH and VRH mechanisms for the as-prepared and
the annealed samples, respectively. The magneto resistance measurements
indicate higher negative magneto resistance in the annealed sample at all
temperatures. The field dependence of magneto resistance at 10K suggests a
co-existing glassy magnetic phase along with the canted antiferromagnetic
structure in the as prepared sample and a suppression of this glassy magnetic
phase in the annealed sample. The combined analyses of all the results
highlight the role of disorder for the magnetic and trasnport properties of
this compound.
