Significant enhancement of superconducting performances of Bi-2212 fibers through combined sodium substitution and LFZ process

Gürsul, M. ; Ergin, I. ; Özçelik, C. ; Depci, T. ; Özçelik, B. ; Madre, M.A. (Universidad de Zaragoza) ; Sotelo, A. (Universidad de Zaragoza)

Resumen: This paper reports the microstructure, magnetoresistivity, electrical and superconducting properties of Bi-2212 fibers with Na+ ions incorporated into a superconducting matrix prepared by a polymer solution method and additionally textured through the laser floating zone process. XRD patterns showed that Bi-2212 phase is the major one with mostly (00l) diffractions due to the grain alignment, independently of Na content. SEM micrographs showed that samples are composed of well-stacked and oriented grains. The irreversibility field (Hirr), upper critical magnetic field (Hc2), coherence length (¿), and activation energies (U) have been calculated using magnetoresistivity measurements and explained based on the thermally activated flux flow (TAFF) model. Considering the resistivity-temperature graph for zero field, Tc values tend to increase from 84.8 K (for the pure sample) to 93.2 K (for 0.075Na sample), slightly decreasing for higher content. Besides, transition temperature width (¿Tc = Tconset - Tcoffset) decreases with the increment in the Na content and reaches its minimum value (¿Tc = 3.7 K) in 0.075Na sample. However, broadening of superconducting transition has been observed with applied field and Tc values decreased to 76.1 K for the pure sample and 86.8 K for 0.075Na sample. Likewise, the activation energies of the samples also decreases significantly with the increase of the magnetic field and the activation energies of the Na-containing samples are found to be higher than the pure sample at each magnetic field value. Hc2(0) values are calculated as 33.8, 43.8, 50.1, 33.1, and 21.4 T for 0.0, 0.075, 0.10, and 0.20 T Na samples, respectively. As a consequence, referring to all experimental results and theoretical findings, the superconducting characteristics improve regularly with Na-doping until x = 0.075 due to increment in the interaction of superconducting clusters, decrement in weak-links and stabilization of charge carriers in CuO2 conducting planes. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Idioma: Inglés

DOI: 10.1007/s10854-021-06305-7

Año: 2021

Publicado en: Journal of Materials Science: Materials in Electronics 32, 13 (2021), 17686-17699
ISSN: 0957-4522

Factor impacto JCR: 2.779 (2021)

Categ. JCR: PHYSICS, APPLIED rank: 80 / 161 = 0.497 (2021) - Q2 - T2
Categ. JCR: ENGINEERING, ELECTRICAL & ELECTRONIC rank: 133 / 274 = 0.485 (2021) - Q2 - T2
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 40 / 69 = 0.58 (2021) - Q3 - T2
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 220 / 344 = 0.64 (2021) - Q3 - T2

Factor impacto CITESCORE: 4.2 - Engineering (Q2) - Physics and Astronomy (Q2) - Materials Science (Q2)

Factor impacto SCIMAGO: 0.464 - Atomic and Molecular Physics, and Optics (Q2) - Bioengineering (Q2) - Condensed Matter Physics (Q2) - Biophysics (Q2) - Electronic, Optical and Magnetic Materials (Q2) - Biomaterials (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/T54-20R
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2017-82183-C3-1-R

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)