Fabrication of Meter‐Long Class Fe(Se,Te)‐Coated Conductors with High Superconducting Performance

Abstract

Previous research results have demonstrated that Fe(Se,Te) films with high critical current density Jc can be realized on flexible metal substrates and are promising for high field applications at 4.2 K. For practical applications, the length of the coated conductor is a key factor. Regarding the fabrication of long Fe(Se,Te)‐coated conductor tapes, the biggest difficulty is how to achieve a breakthrough from static coating to continuous dynamic coating process. Herein, it is demonstrated that Fe(Se,Te)‐coated conductor with high superconducting performance can be continuously fabricated. 1 m‐long Fe(Se,Te)‐coated conductors have been successfully fabricated by multiturn pulsed laser deposition on CeO2‐buffered ion beam‐assisted deposition MgO tape. The Fe(Se,Te)‐coated conductors have high critical temperature of 17.5 K and Jc over 2 MA cm−2 at 4.2 K and self‐field. The end‐to‐end critical current of 1 m‐long Fe(Se,Te)‐coated conductor is as high as 108 A cm−1‐width at 4.2 K and self‐field, and the corresponding Jc is 1.54 MA cm−2, which is above the threshold for industrial applications. The upper critical field at 0 K is deduced to be about 53 T. To the best of knowledge, this is the first demonstration of continuous fabrication of long Fe(Se,Te)‐coated conductors with high performance.

Reassembled phase diagram for Fe y Se x Te1−x superconducting films grown by pulsed laser deposition

“…Since the discovery of F-doped LaOFeAs superconductor in 2008 [1], iron-based superconductors have attracted widespread attention and have become ideal candidate materials for high-field superconducting magnets due to their outstanding advantages, such as ultra-high upper critical magnetic field (H c2 ), high critical temperature (T c ), high critical current density (J c ) and low anisotropy [2][3][4][5][6]. Among all the iron-based * Author to whom any correspondence should be addressed.…”

Unveiling the growth mechanism of FeSeTe films by pulsed laser deposition technique

“…Fe-based superconductors have attracted widespread attention since its discovery in 2008 [1]. Among them, the 11-type FeSeTe superconductors behave high critical temperature (T c ), low anisotropy, ultra-high upper critical magnetic field (H c2 ) and high critical current density (J c ), making them ideal candidates for high-field applications [2][3][4][5][6][7]. Compared with bulk samples, superconducting films can stabilize phases that are not stable in bulk forms, and is more practical for making devices, thus it plays an irreplaceable role in both fundamental * Author to whom any correspondence should be addressed.…”

“…research and practical applications [2,8]. Pulsed laser deposition (PLD) is one of the most common methods to prepare 11-type Fe-based superconducting films [9][10][11][12][13], and involves many preparation parameters, including substrate temperature (T s ), target to substrate distance, laser fluence and so on.…”

Reversible critical current performance of FeSe0.5Te0.5 coated conductor tapes under uniaxial tensile strain

“…Braccini et al [13] estimated J c of the FeSe 0.5 Te 0.5 film at 4.2 K to be about 1 × 10 6 A cm −2 by means of scanning Hall probe microscopy, which is three times the J c measured by the four-probe method. Recently, the FeSe 0.5 Te 0.5 coated conductor tapes with high transport performance were fabricated successfully by Shanghai Jiao Tong University [14], which were promising for magnet applications.…”