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We have investigated the temperature evolution of magnetism and itsinterrelation with structural parameters in perovskite-based layered compoundSr$_2$IrO$_4$, which is believed to be a $J_{eff}$ = 1/2 Mott insulator. Thestructural distortion plays an important role in this material which induces aweak ferromagnetism in otherwise antiferromagnetically ordered magnetic statewith transition temperature around 240 K. Interestingly, at low temperaturebelow around 100 K, a change in magnetic moment has been observed. Temperaturedependent x-ray diffraction measurements show sudden changes in structuralparameters around 100 K are responsible for this. Resistivity measurements showinsulating behavior throughout the temperature range across the magnetic phasetransition. The electronic transport can be described with Mott'stwo-dimensional variable range hopping (VRH) mechanism, however, threedifferent temperature ranges are found for VRH, which is a result of varyinglocalization length with temperature. A negative magnetoresistance (MR) hasbeen observed at all temperatures in contrast to positive behavior generallyobserved in strongly spin-orbit coupled materials. The quadratic fielddependence of MR implies a relevance of a quantum interference effect.

Temperature evolution of magnetic and transport behavior in 5\textit{d} Mott insulator Sr$_2$IrO$_4$: Significance of magneto-structural coupling