Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr3Ir2O7

Phil King, T. Takayama, Anna Tamai, Emil Jerzy Rozbicki, Siobhan Ellen McKeown Walker, M. Shi, L. Patthey, R.G. Moore, D. Lu, K. M. Shen, H. Takagi, Felix Baumberger

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


We investigate the bilayer Ruddlesden-Popper iridate Sr3Ir2O7 by temperature-dependent angle-resolved photoemission. At low temperatures, we find a fully gapped correlated insulator, characterized by a small charge gap and narrow bandwidths. The low-energy spectral features show a pronounced temperature-dependent broadening and non-quasiparticle-like Gaussian line shapes. Together, these spectral features provide experimental evidence for a polaronic ground state. We observe similar behavior for the single-layer cousin Sr2IrO4, indicating that strong electron-boson coupling dominates the low-energy excitations of this exotic family of 5d compounds.

Original languageEnglish
Article number241106
Number of pages6
JournalPhysical Review. B, Condensed matter and materials physics
Issue number24
Publication statusPublished - 24 Jun 2013


  • SR2IRO4
  • Oxide


Dive into the research topics of 'Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr3Ir2O7'. Together they form a unique fingerprint.

Cite this