Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr3Ir2O7
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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.
King , P , Takayama , T , Tamai , A , Rozbicki , E J , McKeown Walker , S E , Shi , M , Patthey , L , Moore , R G , Lu , D , Shen , K M , Takagi , H & Baumberger , F 2013 , ' Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr 3 Ir 2 O 7 ' Physical Review. B, Condensed matter and materials physics , vol 87 , no. 24 , 241106 . DOI: 10.1103/PhysRevB.87.241106
Physical Review. B, Condensed matter and materials physics
©2013 American Physical Society.
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