Title: Nanoscale strain-induced pair suppression as a vortex-pinning mechanism in high-temperature superconductors
Authors: Llordes, A ×
Palau, A
Gazquez, J
Coll, M
Vlad, R
Pomar, A
Arbiol, J
Guzman, R
Ye, S
Rouco, V
Sandiumenge, F
Ricart, S
Puig, T
Varela, M
Chateigner, D
Vanacken, Johan
Gutierrez Royo, Joffre
Moshchalkov, Victor
Deutscher, G
Magen, C
Obradors, X #
Issue Date: Apr-2012
Publisher: Nature Pub. Group
Series Title: Nature Materials vol:11 issue:4 pages:329-336
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.
ISSN: 1476-1122
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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