Time evolution of resistance in response to magnetic field: Evidence of glassy transport in La 0.85 Sr 0.15 CoO 3

We demonstrate the distinct glassy transport phenomena associated with the phase separated and spin‐glass‐like phases of La 0.85 Sr 0.15 CoO 3 , prepared under different heat‐treatment conditions. The low‐temperature annealed (phase‐separated) sample, exhibits a small change in resistance, with evolution of time, as compared to the high‐temperature annealed (spin glass) one. However, the resistance change as a function of time, in both cases, is well described by a stretched exponential fit, signifying the slow dynamics. Moreover, the ultraviolet spectroscopy study evidences a relatively higher density of states in the vicinity of E F for low‐temperature annealed sample and this correctly points to its less semiconducting behavior.