Fe(Se,Te) coated conductors deposited on simple rolling-assisted biaxially textured substrate templates

Abstract

In this paper the feasibility of Fe(Se,Te) Coated Conductors (CC) on simple Rolling-Assisted Biaxilly Textured Substrate (RABiTS) template is studied. Starting from commercially available NiW5% tapes from Evico which have an out-of-plane orientation of about 6° and an in-plane orientation of 5.3°, a RABiTS template for Fe(Se,Te) coated conductors was realized depositing CeO2 thin films on the metallic tape. The oxide buffer layers, deposited via Pulsed Laser Ablation, have an out-of-plane and an in-plane orientation suitable for Fe(Se,Te) deposition and act as a chemical barrier against Ni diffusion. The Fe(Se,Te) deposited on such a simple template show a superconducting transition Tc of 18 K, very high upper critical field values with a Tc,0 of only 3 K in 18 T and self-field transport isotropic critical current values of 10 5 A/cm 2 at 4.2 K, which is reduced of less than one order of magnitude up to 16 T.

Superconducting materials: Challenges and opportunities for large-scale applications

“…On the other hand, thin film technology exhibits its application potential for the fabrication of 11-IBS coated conductors. An almost isotropic Jc of 1.7×10 5 A cm -2 , which is lowered by less than one order of magnitude in high fields up to 18 T, was achieved in Fe(Se,Te) film deposited on a RABiTS template [78].…”

“…On the other hand, thin film technology exhibits its application potential for the fabrication of 11-IBS coated conductors. An almost isotropic J c of 1.7 × 10 5 A cm −2 , which is lowered by less than one order of magnitude in high fields up to 18 T, was achieved in Fe(Se,Te) film deposited on a RABiTS template ( Sylva et al, 2019 ). Considering the simple elemental constituent, the moderate T c (∼16 K), the high upper critical fields, and the relative ease of fabrication for 11-IBS thin films, it is very promising for high-field applications at a low-temperature range ( Pallecchi et al, 2020 ).…”

Superconductors for Magnetic Imaging Resonance Applications

“…At 4.2 K and 10 T, a high Jc of 4104 A/cm 2 was obtained for Cu/Ag sheathed Ba-122 round wire manufactured utilizing hot isostatic pressing densification (HIP) [80]. The groove rolling process gives a local grain alignment perpendicular to the wire axis [81,82]. Table 1 shows the comparison of important properties according to their properties of three high Tc superconductors.…”

Grain Boundaries in Fe-Based Superconductors

“…LAGBs up to 7 • do not hinder the critical current flow, in contrast to the cuprates. In an attempt to reduce the necessary number of buffer layers, Sylva et al deposited Fe(Se,Te) by PLD on Ni5W with a single CeO 2 buffer layer in order to possibly reduce manufacturing costs of FSB coated conductors [105]. The film with a T c of ∼18 K showed a self-field J c of ∼0.16 MA/cm 2 as well as isotropic J c above 20 kA/cm 2 in fields up to 18 T at 4.2 K. In contrast to Ba122, pinning is much more dominated by point-like disorder in Fe(Se,Te) films on IBAD [102] (p, q = 1, 2) and RABiTS [104] (p, q = 0.85, 2) which was attributed to Se-Te disorder.…”