Abstract
We investigate ultrafast dynamics from photoinduced reflectivity of ${\mathrm{Sr}}_{2}{\mathrm{RhO}}_{4}$ by using femtosecond near-infrared pulses. We observe a clear temperature dependent anomaly in its electronic dynamics which slows down below ${T}_{\mathrm{S}}\ensuremath{\sim}160$ K. In addition, coherent oscillations of the 5.3 THz ${A}_{1g}$ phonon exhibit a ${90}^{\ensuremath{\circ}}$ shift in its initial phase across ${T}_{\mathrm{S}}$, indicating a structural change in octahedral rotation distortions. We propose that octahedral structure in ${\mathrm{Sr}}_{2}{\mathrm{RhO}}_{4}$ evolves around ${T}_{\mathrm{S}}$, and it can influence the nonequilibrium dynamics of photo-induced carriers as well as realtime phonon responses.
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