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Role of the Deposition Distance on Nanorod Growth and Flux Pinning in BaZrO3-Doped YBa2Cu3O6+x Thin Films: Implications for Superconducting Tapes

Palonen Heikki; Aye Moe Moe; Paturi Petriina; Rijckaert Hannes; Rivasto Elmeri; Granroth Sari; Huhtinen Hannu; Van Driessche Isabel

Role of the Deposition Distance on Nanorod Growth and Flux Pinning in BaZrO3-Doped YBa2Cu3O6+x Thin Films: Implications for Superconducting Tapes

Palonen Heikki
Aye Moe Moe
Paturi Petriina
Rijckaert Hannes
Rivasto Elmeri
Granroth Sari
Huhtinen Hannu
Van Driessche Isabel
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acsanm.2c04054(1).pdf (4.696Mb)
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AMER CHEMICAL SOC
doi:10.1021/acsanm.2c04054
URI
https://pubs.acs.org/doi/10.1021/acsanm.2c04054
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2022123074101
Tiivistelmä

A complex deposition process of high-temperature superconducting (HTS) thin films and coated conductors is usually optimized by concentrating on the crystalline quality of the material, thus getting the best possible critical temperature and self-field properties. However, most of the HTS power applications that are based on coated conductors act at high magnetic fields, and thus an alternative approach focusing on the formation of an optimal network of columnar flux pinning centers is more reasonable. Therefore, we systematically show how a lengthening of the deposition distance produces perfectly aligned and distinctly longer self-assembled BaZrO3 (BZO) nanorods within the YBa2Cu3O6+x (YBCO) matrix. This method unambiguously enhances in-field properties such as pinning force, critical current density, and its isotropy along the YBCO c axis. The experimental results, especially formation of the c peak where the relative length of the nanorod is a key issue, are confirmed by the vortex dynamics simulations. Finally, we present a semiquantitative model governing the formation of nanorods that explains the experimentally observed improved nanorod growth as a function of the deposition distance via the associated variation of the fractional partial pressure between atomic species within the laser plume.

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