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Title

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

Authors
King, P. D. C.
Takayama, T.
Rozbicki, E.
Shi, M.
Patthey, L.
Moore, R. G.
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Published in Physical Review. B, Condensed Matter. 2013, vol. 87, no. 24
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.
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KING, P. D. C. et al. Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr3Ir2O7. In: Physical Review. B, Condensed Matter, 2013, vol. 87, n° 24. https://archive-ouverte.unige.ch/unige:34919

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Deposited on : 2014-03-24

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