Publication details
Optical Signature of a Crossover from Mott- to Slater-Type Gap in Sr2Ir1-xRhxO4
| Authors | |
|---|---|
| Year of publication | 2020 |
| Type | Article in Periodical |
| Magazine / Source | Physical Review Letters |
| MU Faculty or unit | |
| Citation | |
| web | https://doi.org/10.1103/PhysRevLett.124.027402 |
| Doi | https://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. |