Publication details

Optical Signature of a Crossover from Mott- to Slater-Type Gap in Sr2Ir1-xRhxO4

Authors

XU Bing MARSIK P. SHEVELEVA E. LYZWA F. LOUAT A. BROUET V. MUNZAR Dominik BERNHARD C.

Year of publication 2020
Type Article in Periodical
Magazine / Source Physical Review Letters
MU Faculty or unit

Faculty of Science

Citation
web https://doi.org/10.1103/PhysRevLett.124.027402
Doi http://dx.doi.org/10.1103/PhysRevLett.124.027402
Keywords Metal-insulator transition; Optical conductivity; Iridates; Mott insulators; Reflectivity
Description 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 Neel 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.

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