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

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38 Citations (Scopus)

Abstract

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
Volume87
Issue number24
DOIs
Publication statusPublished - 24 Jun 2013

Keywords

  • SR2IRO4
  • Oxide

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