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
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15.01.2020
Published in:
- 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
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 328232
- DOI 10.1103/PhysRevLett.124.027402
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308350
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