Optical Signature of a Crossover from Mott- to Slater-type Gap in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$

Abstract

With optical spectroscopy we provide evidence that the insulator-metal transition in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$ 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, $T_N$. 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.

arXiv comment6 pages, 4 figures

References in corpus (41)

• Correlated Electrons in High Temperature Superconductors
• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Spin waves and electronic interactions in La2CuO4
• Isospin Dynamics in Sr2IrO4 : Forging Links to Cuprate Superconductivity
• Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity
• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
• The magnetic and crystal structures of Sr2IrO4: A neutron diffraction study
• Microscopic study of spin-orbit-induced Mott insulator in Ir oxides
• Evidence of an odd-parity hidden order in a spin-orbit coupled correlated iridate
• Reduced effective spin-orbital degeneracy and spin-orbital ordering in paramagnetic transition metal oxides: Sr2IrO4 vs. Sr2RhO4
• Two-dimensional Heisenberg behavior of Jeff = 1/2 isospins in the paramagnetic state of spin-orbital Mott insulator Sr2IrO4
• Collapse of the Mott gap and emergence of a nodal liquid in lightly doped Sr${}_2$IrO${}_4$
• Signature of high temperature superconductivity in electron doped Sr2IrO4
• Effective J=1/2 insulating state in Ruddlesden-Popper iridates: An LDA+DMFT study
• Spin-Orbit Integrated Ground State and Magnetic Anisotropy in Sr${}_2$IrO${}_4$
• Electrodynamics of the Nodal Metal in Weakly Doped High-$T_c$ Cuprates
• Spin-orbit tuned metal-insulator transitions in single-crystal Sr2Ir1-xRhxO4 (0\leqx\leq1)
• Magnetic couplings, optical spectra, and spin-orbit exciton in 5d electron Mott insulator Sr2IrO4
• Charge dynamics of doped holes in high Tc cuprates - A clue from optical conductivity
• Dimensionality controlled Mott transition and correlation effects in single- and bi-layer perovskite iridates
• Dilute Magnetism and Spin-Orbital Percolation Effects in Rh-doped Sr2IrO4
• Time-reversal symmetry breaking hidden order in Sr${}_2$(Ir,Rh)O${}_4$
• Temperature dependence of the optical spectral weight in the cuprates: Role of electron correlations
• Transfer of spectral weight across the gap of Sr2IrO4 induced by La doping
• Crossover from coherent to incoherent scattering in spin-orbit dominated Sr2IrO4
• Theoretical study of insulating mechanism in multi-orbital Hubbard models with a large spin-orbit coupling: Slater versus Mott scenario in Sr${}_2$IrO${}_4$
• Structure symmetry determination and magnetic evolution in $\mathrm{S}{\mathrm{r}}_2\mathrm{I}{\mathrm{r}}_{1-\mathrm{x}}\mathrm{R}{\mathrm{h}}_{\mathrm{x}}{\mathrm{O}}_4$
• Electrical Control of Structural and Physical Properties via Strong Spin-Orbit Interactions in Sr2IrO4
• Correlation effects and hidden spin-orbit entangled electronic order in parent and electron-doped iridates Sr${}_2$IrO${}_4$
• Bulk Nature of Layered Perovskite Iridates beyond the Mott Scenario : An Approach from Bulk Sensitive Photoemission Study
• Polaronic features in the optical properties of the Holstein-t-J model
• Spin-density-wave-induced anomalies in the optical conductivity of AFe2As2, (A=Ca, Sr, Ba) single-crystalline iron pnictides
• Formation of an incoherent metallic state in Rh-doped Sr${}_2$IrO${}_4$
• Optical anisotropy of the Jeff = 1/2 Mott insulator Sr2IrO4
• Optical Signatures of Spin-Orbit Exciton in Bandwidth Controlled Sr${}_2$IrO${}_4$ Epitaxial Films via High-Concentration Ca and Ba Doping
• Drude Weight of the Two-Dimensional Hubbard Model -- Reexamination of Finite-Size Effect in Exact Diagonalization Study --
• Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Optical study of Dirac fermions and related phonon anomalies in antiferromagnetic compound CaFeAsF
• Mott transition and collective charge pinning in electron doped Sr2IrO4
• Evidence of Slater-type mechanism as origin of insulating state in Sr2IrO4

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• Metal-insulator transition and antiferromagnetism in the generalized Hubbard model: Treatment of correlation effects
• Quasi-2D anomalous Hall Mott insulator of topologically engineered Jeff =1/2 electrons
• Quantum Criticality in a Layered Iridate
• Evolution of the spectral lineshape at the magnetic transition in Sr2IrO4 and Sr3Ir2O7
• The "dark phase'' in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$ revealed by Seebeck and Hall measurements
• Orbital-Selective Spin-Orbit Mott Insulator in Fractional Valence Iridate La${}_3$Ir${}_3$O${}_{11}$