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Optical signature of a crossover from Mott- to Slater-type gap in ${\mathrm{Sr}}_{2}{\mathrm{Ir}}_{1\ensuremath{-}x}{\mathrm{Rh}}_{x}{\mathrm{O}}_{4}$

Xu, Bîng ; Marsik, Premysl ; Sheveleva, Evgeniia ; Lyzwa, Fryderyk ; Louat, A. ; Brouet, V. ; Munzar, Dominik ; Bernhard, Christian

In: Physical Review Letters, 2020, vol. 124, no. 2, p. 027402

With optical spectroscopy we provide evidence that the insulator-metal transition in Sr2Ir1−xRhxO4 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, TN. Upon Rh doping, it collapses rather rapidly and vanishes around x=0.055. Notably, just as the Mott gap vanishes yet...