Seminars Archive

Electron Doped Strontium Iridates: A 5d Analogue of Cuprates?

Abstract
The insulating ground state of the layered perovskite iridates is often described in a single band pseudospin - 1/2 Hubbard model. Iridates were thus proposed as analogues to the cuprates and as such, a potential platform for engineering high-temperature superconductivity under electron doping [1]. In this seminar, I will discuss our recent work on lightly doped single crystals of the single and bilayer perovskites Sr₂IrO₄ and Sr₃Ir₂O₇ [2,3]. Using La substitution to dope electrons in the IrO₂ plane we induce an unusual metallic state that indeed shares many similarities with cuprates. In particular, our ARPES data on (Sr_(1-x)La_x)₂IrO₄ show Fermi arcs arising from nodal quasiparticles coexisting with an antinodal pseudogap. Moreover, we find evidence for short-range unidirectional order [4] and persistent high-energy magnetic fluctuations within the pseudogap phase [5]. Despite these similarities with cuprates, our samples do not show signs of superconductivity down to 200 mK.

References
[1] F. Wang and T. Senthil, Phys. Rev. Lett. 106, 136402 (2011)
[2] A. de la Torre et al., Phys. Rev. Lett. 113, 256402 (2014)
[3] A. de la Torre et al., Phys. Rev. Lett. 115, 176402 (2015)
[4] I. Battisti et al. Nat. Phys. 13, 21 (2017)
[5] D. Pincini et al. arXiv:1703.09051