Angular dependence of the critical current density in FeSe0.5Te0.5 thin films on metal substrates. (9th November 2021)

• Record Type: Journal Article
• Authors: Fan, Fan; Zhang, Xianping; Cai, Chuanbing; Ma, Yanwei
• Is Part Of: Superconductor science & technology. Volume 34:Number 12(2021)
• Publication Date: 2021-11-09
• Subjects: FeSe0.5Te0.5 thin films -- ion-beam assisted deposition -- critical current density -- iron-based superconductors; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/ac2e5c
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Biaxially textured FeSe0.5 Te0.5 (FST) thin films were fabricated on ion-beam assisted-deposition LaMnO3 (LMO) buffered metal substrate with additional CeO2 as a buffer layer. Profiting from the implementation of CeO2 layers, the resultant FST films show a small out-of-plane misalignment of about 2.04° and an in-plane misalignment around 4.02°. In addition, the films have a high superconducting transition temperature ( T c ) ∼ 17 K and a comparatively high critical current density ( J c ) of 0.78 MA cm −2 in self-field at 4.2 K. On the other hand, a high J c peak for H // c above H // ab at temperatures below 10 K was observed, which results from grain boundaries along the c -axis. In addition, J c peaks for H // ab emerge above 10 K and become more pronounced than those for H // c at 12 K, indicating both a temperature- and field-dependent pinning mechanism. Moreover, J c ( θ ) data except for in the vicinity of H // ab and H // c can be successfully scaled using the anisotropic Ginzburg–Landau approach with an appropriate J c anisotropy ratio of γJ c ∼ 1.5, implying the presence of both ab -plane and c -axis correlated flux pinning centers in FST films.