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Suppression of superconductivity at the nanoscale in chemical solution derived YBa2Cu3O7-δ thin films with defective Y2Ba4Cu8O16 intergrowths.

ABSTRACT: The analysis of the microstructure and superconducting behavior of chemical solution deposited epitaxial YBa2Cu3O7-δ films, with thickness going down to 5 nm has been carried out with the purpose to disclose the behavior of the most common intergrowth in these films, the Y2Ba4Cu8O16. The analysis of ultrathin films is a unique opportunity to investigate the superconducting behavior of these nanoscale defects because of the high concentration created as a consequence of the elastic energy associated to the misfit strain. Magnetic susceptibility and X-ray diffraction measurements evidence a strong decrease of the superconducting volume correlated with an increase of the intergrowth volume fraction. We demonstrate that these intergrowths are non-superconducting nanoscale regions where Cooper pair formation is disrupted, in agreement with their key role as artificial pinning centers for vortices in YBa2Cu3O7-δ films and coated conductors.

SUBMITTER: Li Z 

PROVIDER: S-EPMC9418937 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Suppression of superconductivity at the nanoscale in chemical solution derived YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-<i>δ</i></sub> thin films with defective Y<sub>2</sub>Ba<sub>4</sub>Cu<sub>8</sub>O<sub>16</sub> intergrowths.

Li Ziliang Z   Coll Mariona M   Mundet Bernat B   Palau Anna A   Puig Teresa T   Obradors Xavier X  

Nanoscale advances 20200624 8

The analysis of the microstructure and superconducting behavior of chemical solution deposited epitaxial YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-<i>δ</i></sub> films, with thickness going down to 5 nm has been carried out with the purpose to disclose the behavior of the most common intergrowth in these films, the Y<sub>2</sub>Ba<sub>4</sub>Cu<sub>8</sub>O<sub>16</sub>. The analysis of ultrathin films is a unique opportunity to investigate the superconducting behavior of these nanoscale defects beca  ...[more]

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