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Photoinduced Melting of Antiferromagnetic Order in La0.5Sr1.5MnO4 Measured Using Ultrafast Resonant Soft X-Ray Diffraction

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Wall,  Simon
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, United Kingdom;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

Fulltext (public)

PhysRevLett.106.217401.pdf
(Publisher version), 555KB

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Citation

Ehrke, H., Tobey, R., Wall, S., Cavill, S., Först, M., Khanna, V., et al. (2011). Photoinduced Melting of Antiferromagnetic Order in La0.5Sr1.5MnO4 Measured Using Ultrafast Resonant Soft X-Ray Diffraction. Physical Review Letters, 106(21): 217401. doi:10.1103/PhysRevLett.106.217401.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-19AD-5
Abstract
We used ultrafast resonant soft x-ray diffraction to probe the picosecond dynamics of spin and orbital order in La0.5Sr1.5MnO4 after photoexcitation with a femtosecond pulse of 1.5 eV radiation. Complete melting of antiferromagnetic spin order is evidenced by the disappearance of a (1/4,1/4,1/2) diffraction peak. On the other hand, the (1/4,1/4,0) diffraction peak, reflecting orbital order, is only partially reduced. We interpret the results as evidence of destabilization in the short-range exchange pattern with no significant relaxation of the long-range Jahn-Teller distortions. Cluster calculations are used to analyze different possible magnetically ordered states in the long-lived metastable phase. Nonthermal coupling between light and magnetism emerges as a primary aspect of photoinduced phase transitions in manganites.