Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y₂O₃ mixed phase additions

Abstract

Abstract. Adding nanophase defects to YBa2Cu3O7-δ (YBCO) superconductor thin films is wellknown to enhance flux pinning, resulting in an increase in current density (Jct). While many previous studies focused on single phase additions, the addition of several phases simultaneously shows promise in improving current density by combining different pinning mechanisms. This paper compares the effect of the addition of two insulating, nonreactive phases of barium zirconium oxide (BZO) and yttrium oxide Y2O3, both as a single addition of BZO and as a double addition in conjunction with Y2O3. Processing parameters vary the target composition volume percent of BZO from 2-6 vol. %, while maintaining 3 vol. % Y2O3, and the remaining vol. % YBCO. Pulsed laser deposition produced thin films on LaAlO3 (LAO) and SrTiO3 (STO) substrates at various deposition temperatures. Comparison of strong and weak flux pinning mechanisms, current densities, critical temperatures, and microstructures of the resulting films will be presented. Films produced from the 2 vol. % BZO + 3 vol. Y2O3 doped YBCO target at a deposition temperature of 825 °C attained the highest current density. The addition of second phase Y2O3 impacted the film microstructure, resulting in more isotropic behavior when compared to the YBCO films doped with only BZO. . Liu utilized a 1.5 vol. % BZO and YBCO target to produce films on LAO decorated with Y2O3 nano-islands [5]. Optimization of film thickness for films consisting of YBCO with BZO and Y2O3 has also been studied, utilizing a 5 mol. % BZO and 5 mol. % Y2O3 target [6]. It is hypothesized that the combination of BZO and Y2O3 with YBCO influences the lattice strain in the film. This research seeks to explore the effects on current density of doping a YBCO target with 2, 4, and 6 volume percent BZO along with 3 vol. percent Y2O3, with the remaining volume percent YBCO.

Nanosized Pinning Centers in the Rare Earth-Barium-Copper-Oxide Thin-Film Superconductors

“…A synergy between 1D and 0D pinning centers had been shown for various perovskite-based phases (forming 1D nanorods) with nanoparticles at the same time [121,154,155]. A well-known combination of these artificial pinning centers is BaZrO 3 and Y 2 O 3 [156][157][158] (similar behavior had also been reported in similar perovskites such as BaSnO 3 [159] and BaHfO 3 [160]). Nanomaterials have specific properties that should be taken into consideration before use.…”

Увеличение Критического Тока Сверхпроводящих Композитов При Имплантации Ионов Железа

“…Наряду с монодобавками, рассматривался способ создания структур с комбинацией точечных и колончатых дефектов [24]. Хорошо известной комбинацией этих искусственных центров пиннинга являются BaZrO 3 и Y 2 O 3 [25,26], а также BaSnO 3 [27].…”

An increase in the critical current of superconducting composites upon implantation of iron ions

“…Along with monoadditives, a method of structure creation with a combination of point and columnar defects was considered [24]. A well-known combination of these artificial centers of pinning are BaZrO 3 and Y 2 O 3 [25,26], as well as BaSnO 3 [27].…”