1 1 A ug 2 01 7 Staging superstructures in highT c Sr / O co-doped La

P. J. Ray, ∗ N. H. Andersen, T. B. S. Jensen, H. E. Mohottala, 4 Ch. Niedermayer, K. Lefmann, B. O. Wells, M. v. Zimmermann, and L. Udby Nanoscience Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark Physics Department, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark Department of Physics, University of Connecticut, U-3046, 2152 Hillside Road, Storrs, Connecticut 06269-3046, USA Department of Physics, University of Hartford, 200, Bloomfield Ave., West Hartford, CT-06117, USA Laboratory for Neutron Scattering, ETHZ & PSI, Ch-5232 Villigen PSI, Switzerland Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany (Dated: July 5, 2018)