Magneto-optical characterizations of FeTe${}_{0.5}$Se${}_{0.5}$ thin films with critical current density over 1 MA/cm${}^2$

Abstract

We performed magneto-optical (MO) measurements on FeTe${}_{0.5}$Se${}_{0.5}$ thin films grown on LaAlO${}_3$ (LAO) and Yttria-stabilized zirconia (YSZ) single-crystalline substrates. These thin films show superconducting transition temperature, $T_c$ $\sim$ 19 K, 4 K higher than the bulk sample. Typical roof-top patterns can be observed in the MO images of thin films grown on LAO and YSZ, from which a large and homogeneous critical current density, $J_c$, over 1 $\times$ 10${}^6$ A/cm${}^2$ at 5 K was obtained. Magnetic flux penetration measurement reveals that the current is almost isotropically distributed in the two thin films. Compared with bulk crystals, FeTe${}_{0.5}$Se${}_{0.5}$ thin film demonstrates not only higher $T_c$, but also much larger $J_c$, which is attractive for applications.

arXiv comment13 pages, 7 figures

References in corpus (12)

• Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
• High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks
• Tc=21K in epitaxial FeSe0.5Te0.5 thin films with biaxial compressive strain
• Weak anisotropy of the superconducting upper critical field in Fe1.11Te0.6Se0.4 single crystals
• Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor
• Iron-chalcogenide FeSe${}_{0.5}$Te${}_{0.5}$ coated superconducting tapes for high field applications
• Dynamics and mechanism of oxygen annealing in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystal
• Magnetic relaxation and collective vortex creep in FeTe${}_{0.6}$Se${}_{0.4}$ single crystal
• Evolution of Superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ Annealed in Te Vapor
• Anisotropies and Homogeneities of Superconducting Properties in Iron-Platinum-Arsenide Ca10(Pt3As8)(Fe1.79Pt0.21As2)5

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