Flux Pinning Mechanism of Nb-doped YBCO Film

doi:10.15541/jim20190001

Abstract

Abstract:

Nb doped YBa₂Cu₃O_7-_x(YBCO) film was fabricated by metal organic deposition (MOD) method. BYNO thin film composed of Nb element was obtained with the size ranged from 20-30 nm. It is indicated that the epitaxial and random oriented BYNO nanoparticles were coexisted in YBCO film and mainly shows random orientation. Strengthening of nanostrains can be attributed towards the stacking fault parallel to the film and the lattice distortion around the BYNO nanoparticles inside the thin film. As the random fraction of BYNO increasing, the nanostrain within nanocomposites was strengthened. The nanostrain increases the magnetic flux pinning ability of the film, thereby improving the superconducting properties of the film under high magnetic field.

Key words: YBCO film, BYNO nanoparticles, random oriented, nanostrain, pinning property

CLC Number:

TQ174

WANG Ya, SUO Hong-Li, MAO Lei, LIU Min, MA Lin, WANG Yi, KAUSAR Shaheen, ZHOU Yu-Qi. Flux Pinning Mechanism of Nb-doped YBCO Film[J]. Journal of Inorganic Materials, 2019, 34(10): 1055-1059.

Figures/Tables 8

Fig. 1 2D-XRD frames of YBCO/BYNO film with 13mol% dopant (a)2θ scan of 25°-45°; (b) 2θ scan of 45°-75°

Fig. 2 2D-XRD diffraction patterns of nanocomposite film at χ=45° (a) Diffract region of random nanoparticles; (b) Diffract region of random and epitaxial nanoparticles

Table 1 Fraction of random oriented BYNO nanoparticles of YBCO/BYNO nanocomposites with different content of Nb dopant

Doping amount of Nb/mol%	Content of random BYNO nanoparticles/%
5	86.25
8	88.90
10	93.30

Fig. 3 Cross-section TEM images of YBCO/BYNO nanocomposite film (a) BYNO nanoparticle within YBCO matrix; (b) BYNO nanoparticle at the interface of substrate; (c) Bent YBCO around BYNO nanoparticle

Fig. 4 Nanostrain in the YBCO/BYNO nanocomposite film with 10mol% dopant

Fig. 5 Nanostrain of nanocomposite with different content of Nb dopant

Fig. 6 Field dependence of Jc (a) and Fp (b) values for YBCO/BYNO film with different doping contents

Fig. 7 Relationship between nanostrain and pinning force

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