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Instruments / Technical Area	Publication Details	Published	Actions
I06-Nanoscience	Femtosecond x rays link melting of charge-density wave correlations and light-enhanced coherent transport in YBa2Cu3O6.6 M. Forst , A. Frano , S. Kaiser , R. Mankowsky , C. R. Hunt , J. J. Turner , G. L. Dakovski , M. P. Minitti , J. Robinson , T. Loew , M. Le Tacon , B. Keimer , J. P. Hill , A. Cavalleri , S. Dhesi Physical Review 90 (18) DOI: 10.1103/PhysRevB.90.184514 Show Abstract ▼ Abstract: We use femtosecond resonant soft x-ray diffraction to measure the optically stimulated ultrafast changes of charge-density wave correlations in underdoped YBa2Cu3O6.6. We find that when coherent interlayer transport is enhanced by optical excitation of the apical oxygen distortions, at least 50% of the in-plane charge-density wave order is melted. These results indicate that charge ordering and superconductivity may be competing up to the charge ordering transition temperature, with the latter becoming a hidden phase that is accessible only by nonlinear phonon excitation.	Nov 2014
I16-Materials and Magnetism	Multiple supersonic phase fronts launched at a complex-oxide heterointerface M. Forst , K. R. Beyerlein , R. Mankowsky , W. Hu , G. Mattoni , S. Catalano , M. Gibert , O. Yefanov , J. N. Clark , A. Frano , J. M. Glownia , M. Chollet , H. Lemke , B. Moser , S. P. Collins , S. S. Dhesi , A. D. Caviglia , J.-M. Triscone , A. Cavalleri Physical Review Letters 118 DOI: 10.1103/PhysRevLett.118.027401 Diamond Proposal Number(s): [11118] Show Abstract ▼ Abstract: Selective optical excitation of a substrate lattice can drive phase changes across heterointerfaces. This phenomenon is a nonequilibrium analogue of static strain control in heterostructures and may lead to new applications in optically controlled phase change devices. Here, we make use of time-resolved nonresonant and resonant x-ray diffraction to clarify the underlying physics and to separate different microscopic degrees of freedom in space and time. We measure the dynamics of the lattice and that of the charge disproportionation in NdNiO3, when an insulator-metal transition is driven by coherent lattice distortions in the LaAlO3 substrate. We find that charge redistribution propagates at supersonic speeds from the interface into the NdNiO3 film, followed by a sonic lattice wave. When combined with measurements of magnetic disordering and of the metal-insulator transition, these results establish a hierarchy of events for ultrafast control at complex-oxide heterointerfaces.	Jan 2017

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