Square Lattice Iridates

Abstract

Over the last few years, Sr${}_2$IrO${}_4$, a single-layer member of the Ruddlesden-Popper series iridates, has received much attention as a close analog of cuprate high-temperature superconductors. Although there is not yet firm evidence for superconductivity, a remarkable range of cuprate phenomenology has been reproduced in electron- and hole-doped iridates including pseudogaps, Fermi arcs, and $d$-wave gaps. Further, a number of symmetry breaking orders reminiscent of those decorating the cuprate phase diagram have been reported using various experimental probes. We discuss how the electronic structures of Sr${}_2$IrO${}_4$ through strong spin-orbit coupling leads to the low-energy physics that had long been unique to cuprates, what the similarities and differences between cuprates and iridates are, and how these advance the field of high-temperature superconductivity by isolating essential ingredients of superconductivity from a rich array of phenomena that surround it. Finally, we comment on the prospect of finding a new high-temperature superconductor based on the iridate series.

Annu. Rev. Condens. Matter Phys. (in press)

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Cited by in corpus (2)

• Observation of spin-orbit excitations and Hund's multiplets in Ca${}_2$RuO${}_4$
• Orbital Symmetry and Orbital Excitations in High-$T_c$ Superconductors