Monte Carlo study of an unconventional superconducting phase in Ir-oxide J_{eff}=1/2 Mott insulators induced by carrier doping

Abstract

Based on a microscopic theoretical study, we show that novel superconductivity is induced by carrier doping in layered perovskite Ir oxides where a strong spin-orbit coupling causes an effective total angular momentum J_{eff}=1/2 Mott insulator. Using a variational Monte Carlo method, we find an unconventional superconducting state in the ground state phase diagram of a t_{2g} three-orbital Hubbard model on the square lattice. This superconducting state is characterized by a d_{x^2-y^2}-wave "pseudospin singlet" formed by the J_{eff}=1/2 Kramers doublet, which thus contains inter-orbital as well as both singlet and triplet components of t_{2g} electrons. The superconducting state is found stable only by electron doping, but not by hole doping, for the case of carrier doped Sr_2IrO_4. We also study an effective single-orbital Hubbard model to discuss the similarities to high-T_c cuprate superconductors and the multi-orbital effects.

arXiv comment5 pages, 4 figures, accepted for publication in Physical Review Letters

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Cited by in corpus (118)

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• Observation of a $d$-wave gap in electron-doped Sr${}_2$IrO${}_4$
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• The Challenge of Spin-Orbit-Tuned Ground States in Iridates
• 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
• Odd-parity triplet superconductivity in multi-orbital materials with strong spin-orbit coupling: applications to doped Sr2IrO4
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• Square Lattice Iridates
• A structural distortion induced magneto-elastic locking in Sr${}_2$IrO${}_4$ revealed through nonlinear optical harmonic generation
• Persistent paramagnons deep in the metallic phase of Sr${}_{2-x}$La${}_x$IrO${}_4$
• Dilute Magnetism and Spin-Orbital Percolation Effects in Rh-doped Sr2IrO4
• Two-dimensional $J_{\mathrm{eff}}$ = 1/2 antiferromagnetic insulator unraveled from interlayer exchange coupling in artificial perovskite iridate superlattices
• Tuning Magnetic Coupling in Sr${}_2$IrO${}_4$ Thin Films with Epitaxial Strain
• Local density of states study of a spin-orbit-coupling induced Mott insulator Sr${}_2$IrO${}_4$
• Multipole superconductivity in nonsymmorphic Sr${}_2$IrO${}_4$
• Relativistic $GW$+BSE study of the optical properties of Ruddlesden-Popper iridates
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• Correlated Quantum Phenomena of Spin-Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO3 and SrIrO3-Based Artificial Superlattices
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• Band-Renormalization Effects and Predominant Antiferromagnetic Order in Two-Dimensional Hubbard Model
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• Nanoscale Sr${}_2$IrO${}_4$ Freestanding Thin-Films for Flexible Electronics
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• Assessing the orbital selective Mott transition with variational wave functions
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• Model-mapped RPA for determining the effective Coulomb interaction
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• Carrier density crossover and quasiparticle mass enhancement in a doped 5$d$ Mott insulator
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• Constraints on the two-dimensional pseudo-spin 1/2 Mott insulator description of Sr${}_2$IrO${}_4$
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