Optical Signature of a Crossover from Mott- to Slater-type Gap in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$

Abstract

With optical spectroscopy we provide evidence that the insulator-metal transition in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$ occurs close to a crossover from the Mott- to the Slater-type. The Mott-gap at $x=0$ persists to high temperature and evolves without an anomaly across the Néel temperature, $T_N$. Upon Rh-doping, it collapses rather rapidly and vanishes around $x=0.055$. Notably, just as the Mott-gap vanishes yet another gap appears that is of the Slater-type and develops right below $T_N$. This Slater-gap is only partial and is accompanied by a reduced scattering rate of the remaining free carriers, similar as in the parent compounds of the iron arsenide superconductors.

6 pages, 4 figures

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Cited by in corpus (8)

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• A Hubbard exciton fluid in a photo-doped antiferromagnetic Mott insulator
• Metal-insulator transition and antiferromagnetism in the generalized Hubbard model: Treatment of correlation effects
• Quasi-2D anomalous Hall Mott insulator of topologically engineered Jeff =1/2 electrons
• Quantum Criticality in a Layered Iridate
• Evolution of the spectral lineshape at the magnetic transition in Sr2IrO4 and Sr3Ir2O7
• The "dark phase'' in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$ revealed by Seebeck and Hall measurements
• Orbital-Selective Spin-Orbit Mott Insulator in Fractional Valence Iridate La${}_3$Ir${}_3$O${}_{11}$