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Instruments / Technical Area	Publication Details	Published
I06-Nanoscience	Light control of orbital domains: case of the prototypical manganite La0.5Sr1.5MnO4 Timothy Miller , Michael Gensch , Simon Wall Physica Scripta 91 DOI: 10.1088/0031-8949/91/12/124002 Diamond Proposal Number(s): [9158, 10430] Show Abstract ▼ Abstract: Control of electronic and structural ordering in correlated materials on the ultrafast timescale with light is a new and emerging approach to disentangle the complex interplay of the charge, spin, orbital and structural degree of freedom. In this paper we present an overview of how orbital order and orbital domains can be controlled by near IR and THz radiation in the layered manganite La0.5Sr1.5MnO4. We show how near-IR pumping can efficiently and rapidly melt orbital ordering. However, the nanoscale domain structure recovers unchanged demonstrating the importance of structural defects for the orbital domain formation. On the contrary, we show that pulsed THz fields can be used to effectively orientate the domains. In this case the alignment depends on the in-plane electric field polarisation and is induced by an energy penalty that arises from THz field induced hopping of the localised charges.	Dec 2016
I06-Nanoscience	Photoinduced melting of antiferromagnetic order in La0.5Sr1.5MnO4 measured using ultrafast resonant soft X-ray diffraction H. Ehrke , R. I. Tobey , S. A. Wall , S. Cavill , M. Foerst , V. Khanna , T. Garl , N. Stojanovic , D. Prabhakaran , A. Boothroyd , M. Gensch , A. Mirone , P. Reutler , A. Revcolevschi , S. S. Dhesi , A. Cavalleri Physical Review Letters 106 (21), 217401 DOI: 10.1103/PhysRevLett.106.217401 PMID: 21699341 Show Abstract ▼ 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 (14 ,14 ,12 ) diffraction peak. On the other hand, the (14 ,14 ,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.	May 2011
I06-Nanoscience	Ultrafast Resonant Soft X-Ray Scattering in Manganites: Direct Measurement of Time-Dependent Orbital Order Henri Ehrke , Raanan Tobey , Simon Wall , Stuart Cavill , D. Prabhakaran , Andrew Boothroyd , Michael Gensch , P Reutler , Alexandre Revcolevschi , Sarnjeet Dhesi , Andrea Cavalleri International Conference on Ultrafast Phenomena (UP) DOI: 10.1364/UP.2010.ME48 Show Abstract ▼ Abstract: We present ultrafast resonant soft-X-ray diffraction measurements of time-dependent orbital order in the single-layer-manganite La0.5Sr1.5MnO4. These experiments reveal the appearance of a metastable phase with reduced ordering, different from any thermal state of the system.	Jul 2010

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