Enhanced Critical Current Density of FeF2 Added YBa2Cu3O7−δ

Abstract

The effect of nanosized FeF 2 (∼120 nm) addition on the critical current density, J c , of YBa 2 Cu 3 O 7−δ was studied. YBa 2 Cu 3 O 7−δ superconductor was prepared by the solid-state reaction method with addition of 0 to 0.10 wt% FeF 2 additions. The magnetization critical current density, J cm (at 77 K), was estimated from the extended Bean model by using vibrating sample magnetometer (VSM) measurements. The transport critical current density, J ct , was measured using the four-point probe method with the 1 μV/cm criterion. The onset transition temperature, T c-onset showed a maximal value at 92 K for 0 to 0.03 wt% additions. J c increased with FeF 2 addition up to 0.03 wt%. Addition of FeF 2 of more than 0.03 wt% suppressed T c-onset and J c . The inter-grain current density was enhanced by two orders of magnitude on 0.03 wt% FeF 2 addition. In addition to the condensation energy associated with their core, the full vortex magnetic energy by addition of nanosized FeF 2 enhanced J c in the system.

Analisis Kekonduksian Lebihan Superkonduktor YBa2Cu3O7-δ Ditambah Nanozarah PbO

“…Terdapat beberapa laporan mengenai peningkatan sifat superkonduktor dengan pengedopan zarah bersaiz nano dan mikro seperti NiO, Y 2 O 3 , SnO 2 , TiO 2 dan FeF 2 (Abd-Shukor et al 2012;Campbell et al 2005;Hamid & Abd-Shukor 2000;He et al 2001;Zhao et al 2005) dalam superkonduktor suhu tinggi berasaskan kuprum oksida. Nanozarah boleh bertindak balas dengan bahan superkonduktor semasa proses penyediaan.…”

Effect of nano-sized Co3O4 addition on the transport properties of YBa2Cu3O7−δ

“…%) of nano-sized FeF 2 was added in YBCO. 16 An increase in the critical current density is expected when the size of the pinning center is larger than the coherence length, . 17 The coherence length of the YBa 2 Cu 3 O 7 system is between 0.2 and 3 nm, and the penetration depth, is about 140 nm.…”