| Literature DB >> 27159018 |
M P M Dean1, Y Cao1, X Liu2,3, S Wall4, D Zhu5, R Mankowsky6,7, V Thampy1, X M Chen1, J G Vale8, D Casa9, Jungho Kim9, A H Said9, P Juhas1, R Alonso-Mori5, J M Glownia5, A Robert5, J Robinson5, M Sikorski5, S Song5, M Kozina5, H Lemke5, L Patthey10, S Owada11, T Katayama12, M Yabashi11, Yoshikazu Tanaka11, T Togashi12, J Liu13, C Rayan Serrao14, B J Kim15, L Huber16, C-L Chang17, D F McMorrow8, M Först6,7, J P Hill1.
Abstract
Measuring how the magnetic correlations evolve in doped Mott insulators has greatly improved our understanding of the pseudogap, non-Fermi liquids and high-temperature superconductivity. Recently, photo-excitation has been used to induce similarly exotic states transiently. However, the lack of available probes of magnetic correlations in the time domain hinders our understanding of these photo-induced states and how they could be controlled. Here, we implement magnetic resonant inelastic X-ray scattering at a free-electron laser to directly determine the magnetic dynamics after photo-doping the Mott insulator Sr2IrO4. We find that the non-equilibrium state, 2 ps after the excitation, exhibits strongly suppressed long-range magnetic order, but hosts photo-carriers that induce strong, non-thermal magnetic correlations. These two-dimensional (2D) in-plane Néel correlations recover within a few picoseconds, whereas the three-dimensional (3D) long-range magnetic order restores on a fluence-dependent timescale of a few hundred picoseconds. The marked difference in these two timescales implies that the dimensionality of magnetic correlations is vital for our understanding of ultrafast magnetic dynamics.Entities:
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Year: 2016 PMID： 27159018 DOI： 10.1038/nmat4641
Source DB: PubMed Journal: Nat Mater ISSN： 1476-1122 Impact factor: 43.841