Strong lattice correlation of non-equilibrium quasiparticles in a pseudospin-1/2 Mott insulator Sr2IrO4

Li, Yuelin; Schaller, Richard D.; Zhu, Mengze; Walko, Donald A.; Kim, Jungho; Ke, Xianglin; Miao, Ludi; Mao, Z. Q.

doi:10.1038/srep19302

Title: Strong lattice correlation of non-equilibrium quasiparticles in a pseudospin-1/2 Mott insulator Sr₂IrO₄

Journal Article · 20 January 2016 · Scientific Reports

DOI: https://doi.org/10.1038/srep19302 · OSTI ID:1258620

Li, Yuelin ^[1]; Schaller, Richard D. ^[2]; Zhu, Mengze ^[3]; Walko, Donald A. ^[1]; Kim, Jungho ^[1]; Ke, Xianglin ^[3]; Miao, Ludi ^[4]; Mao, Z. Q. ^[4]

Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Michigan State Univ., East Lansing, MI (United States)
Tulane Univ., New Orleans, LA (United States)

In correlated oxides the coupling of quasiparticles to other degrees of freedom such as spin and lattice plays critical roles in the emergence of symmetry-breaking quantum ordered states such as high temperature superconductivity. We report a strong lattice coupling of photon-induced quasiparticles in spin-orbital coupling Mott insulator Sr₂IrO₄ probed via optical excitation. Combining time-resolved x-ray diffraction and optical spectroscopy techniques, we reconstruct a spatiotemporal map of the diffusion of these quasiparticles. Lastly, due to the unique electronic configuration of the quasiparticles, the strong lattice correlation is unexpected but extends the similarity between Sr₂IrO₄ and cuprates to a new dimension of electron-phonon coupling which persists under highly non-equilibrium conditions.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1258620

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Strong lattice correlation of non-equilibrium quasiparticles in a pseudospin-1/2 Mott insulator Sr₂IrO₄