Photoinduced melting of antiferromagnetic order in La(0.5)Sr(1.5)MnO4 measured using ultrafast resonant soft x-ray diffraction |
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Authors: | Ehrke H Tobey R I Wall S Cavill S A Först M Khanna V Garl Th Stojanovic N Prabhakaran D Boothroyd A T Gensch M Mirone A Reutler P Revcolevschi A Dhesi S S Cavalleri A |
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Affiliation: | Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, United Kingdom. |
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Abstract: | We used ultrafast resonant soft x-ray diffraction to probe the picosecond dynamics of spin and orbital order in La(0.5)Sr(1.5)MnO(4) 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. |
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