Journal
NATURE MATERIALS
Volume 15, Issue 6, Pages 601-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4641
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Funding
- US Department of Energy Basic Energy Sciences Division of Materials Science and Engineering
- MOST [2015CB921302]
- CAS of China [XDB07020200]
- Laboratory Directed Research and Development (LDRD) Program [12-007]
- US Department of Energy [DE-AC02-06CH11357]
- Spanish MINECO [SEV-2015-0522]
- Ramon y Cajal programme [RYC-2013-14838]
- Marie Curie Career Integration Grant [PCIG12 GA 2013 618487]
- Fundacio Privada Cellex
- Science Alliance Joint Directed Research and Development Program at the University of Tennessee
- EPSRC
- DOE Office of Science User Facility [DE-AC02-76SF00515]
- Engineering and Physical Sciences Research Council [EP/N027671/1, 1745233, EP/N034694/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [25247054] Funding Source: KAKEN
- EPSRC [EP/N034694/1, EP/N027671/1] Funding Source: UKRI
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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(1-4). Recently, photo-excitation has been used to induce similarly exotic states transiently(5-7). 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 Neel 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.
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