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We perform a time-resolved optical study of Sr[subscript 2]IrO[subscript 4] to understand the influence of magnetic ordering on the low energy electronic structure of a strongly spin-orbit coupled J[subscript eff] = 1/2 Mott insulator. By studying the recovery dynamics of photoexcited carriers, we find that upon cooling through the Néel temperature T[subscript N] the system evolves continuously from a metal-like phase with fast (∼50 fs) and excitation density independent relaxation dynamics to a gapped phase characterized by slower (∼500 fs) excitation density-dependent bimolecular recombination dynamics, which is a hallmark of a Slater-type metal-to-insulator transition. However our data indicate that the high energy reflectivity associated with optical transitions into the unoccupied J[subscript eff] = 1/2 band undergoes the sharpest upturn at T[subscript N], which is consistent with a Mott-Hubbard type metal-to-insulator transition involving spectral weight transfer into an upper Hubbard band. These findings show Sr[subscript 2]IrO[subscript 4] to be a unique system in which Slater- and Mott-Hubbard-type behaviors coexist and naturally explain the absence of anomalies at T[subscript N] in transport and thermodynamic measurements.United States. Army Research Office (Grant W911NF-11-1-0331

physical review. b, condensed matter and materials physics

Observation of a metal-to-insulator transition with both Mott-Hubbard and Slater characteristics in Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>IrO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>from time-resolved photocarrier dynamics

Observation of a metal-to-insulator transition with both Mott-Hubbard and Slater characteristics in Sr2IrO4from time-resolved photocarrier dynamics