@article{95a66664f806498e9ba784d7686ba1ba,
title = "Nanoscale strain-induced pair suppression as a vortex-pinning mechanism in high-temperature superconductors",
abstract = "Boosting large-scale superconductor applications require nanostructured conductors with artificial pinning centres immobilizing quantized vortices at high temperature and magnetic fields. Here we demonstrate a highly effective mechanism of artificial pinning centres in solution-derived high-temperature superconductor nanocomposites through generation of nanostrained regions where Cooper pair formation is suppressed. The nanostrained regions identified from transmission electron microscopy devise a very high concentration of partial dislocations associated with intergrowths generated between the randomly oriented nanodots and the epitaxial YBa2Cu3O7 matrix. Consequently, an outstanding vortex-pinning enhancement correlated to the nanostrain is demonstrated for four types of randomly oriented nanodot, and a unique evolution towards an isotropic vortex-pinning behaviour, even in the effective anisotropy, is achieved as the nanostrain turns isotropic. We suggest a new vortex-pinning mechanism based on the bond-contraction pairing model, where pair formation is quenched under tensile strain, forming new and effective core-pinning regions.",
author = "A. Llord{\'e}s and A. Palau and J. G{\'a}zquez and M. Coll and R. Vlad and A. Pomar and J. Arbiol and R. Guzm{\'a}n and S. Ye and V. Rouco and F. Sandiumenge and S. Ricart and T. Puig and M. Varela and D. Chateigner and J. Vanacken and J. Guti{\'e}rrez and V. Moshchalkov and G. Deutscher and C. Magen and X. Obradors",
note = "Funding Information: The authors would like to thank the Ministerio Ciencia e Innovaci{\'o}n (MAT2008-01022), Consolider NANOSELECT (CSD2007-00041), Generalitat de Catalunya (2009 SGR 770 and Xarmae) and the European Union (HIPERCHEM, NESPA and the European Research Council Starting Investigator Award). Work at Oak Ridge National Laboratory was supported by the US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division (M.V.). One of us (G.D.) acknowledges partial support from US Air Force grant FA 8655-10-1-3011. Work at Instituto Nanociencia Arag{\'o}n—Laboratorio Microscop{\'i}as Avanzadas was partially supported by NanoAraCat.",
year = "2012",
month = apr,
doi = "10.1038/nmat3247",
language = "אנגלית",
volume = "11",
pages = "329--336",
journal = "Nature Materials",
issn = "1476-1122",
publisher = "Nature Publishing Group",
number = "4",
}