Nanoscale strain-induced pair suppression as a vortex-pinning mechanism in high-temperature superconductors.

Nature Materials
A LlordésX Obradors

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 YBa(2)Cu(3)O(7) 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.

References

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Citations

Aug 21, 2013·Micron : the International Research and Review Journal for Microscopy·T NishiyamaY Shiohara
Sep 6, 2013·Accounts of Chemical Research·Delia J MillironBrett A Helms
Feb 3, 2016·Nano Letters·Anna KremenBeena Kalisky
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Jan 15, 2014·Chemical Society Reviews·X ObradorsN Mestres
May 16, 2019·Proceedings of the National Academy of Sciences of the United States of America·Leonardo Civale
Jul 28, 2020·Nanomaterials·Filip AntončíkVilém Bartůněk
Feb 13, 2021·ACS Applied Materials & Interfaces·Albert QueraltóTeresa Puig
Sep 29, 2020·Chemistry of Materials : a Publication of the American Chemical Society·Michael A HopeClare P Grey
Dec 1, 2020·Nano Letters·Yang-Yang LyuWai-Kwong Kwok
Jan 24, 2020·ACS Applied Materials & Interfaces·Yisong LinJudith MacManus-Driscoll

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