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

doi:10.1103/PhysRevLett.124.027402

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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 University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
Marsik, Premysl University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
Sheveleva, Evgeniia University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
Lyzwa, Fryderyk University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
Louat, A. Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, Orsay, France
Brouet, V. Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, Orsay, France
Munzar, Dominik Department of Condensed Matter Physics, Faculty of Science, and Central European Institute of Technology, Masaryk University, Brno, Czech Republic
Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland

15.01.2020

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

English 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 another gap appears that is of the Slater-type and develops right below TN. 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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

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