1. Spectroscopic evidence for electron-boson coupling in electron-doped Sr$_2$IrO$_4$
- Author
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Hu, Yong, Chen, Xiang, Peng, S. -T., Lane, C., Matzelle, M., Sun, Z. -L., Hashimoto, M., Lu, D. -H., Schwier, E. F., Arita, M., Wu, T., Markiewicz, R. S., Shimada, K., Chen, X. -H., Shen, Z. -X., Bansil, A., Wilson, S. D., and He, J. -F.
- Subjects
Condensed Matter - Superconductivity ,Condensed Matter - Materials Science ,Condensed Matter - Strongly Correlated Electrons - Abstract
The pseudogap, d-wave superconductivity and electron-boson coupling are three intertwined key ingredients in the phase diagram of the cuprates. Sr$_2$IrO$_4$ is a 5d-electron counterpart of the cuprates in which both the pseudogap and a d-wave instability have been observed. Here, we report spectroscopic evidence for the presence of the third key player in electron-doped Sr$_2$IrO$_4$: electron-boson coupling. A kink in nodal dispersion is observed with an energy scale of ~50 meV. The strength of the kink changes with doping, but the energy scale remains the same. These results provide the first noncuprate platform for exploring the relationship between the pseudogap, d-wave instability and electron-boson coupling in doped Mott insulators.
- Published
- 2019
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