Spectroscopic Evidence for Polaronic Behaviour of the Strong Spin-Orbit Insulator Sr(sup 3)Ir(sup2)O(sup 7).

King, P. D. C. ; Takayama, T. ; Tamai, A. ; Rozbicki, E. ; Walker, S. M. K. ; Shi, M. ; Patthey, L. ; Moore, R. G. ; Lu, D. ; Shen, K. M.

Technical Information Center Oak Ridge Tennessee

关键词: Polarons;    Bosons;    Coupling;    Cuprates;    Electrons;   

RP-ID  :  DE141154710

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We investigate the bilayer Ruddlesden-Popper iridate Sr3Ir2O7 by temperature-dependent angle-resolved photoemission. We find a narrow-gap correlated insulator, with spectral features indicative of a polaronic ground state, strikingly similar to that observed previously for the parent compounds of the cuprate superconductors. We additionally observe similar behaviour for the single-layer cousin Sr2IrO4, indicating that strong electron-boson coupling dominates the low-energy excitations of this exotic family of materials, and providing a microscopic link between the insulating ground states of the seemingly-disparate 3d cuprates and 5d iridates.