Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films

Abstract

We report on the transport properties of clean, epitaxial Fe(Se,Te) thin films prepared on Fe-buffered MgO (001) single crystalline substrates by pulsed laser deposition. Near Tc a steep slope of the upper critical field for H||ab was observed (74.1 T/K), leading to a very short out-of-plane coherence length, ξc, of 0.2 nm, yielding 2ξc(0) approximately 0.4 nm. This value is shorter than the interlayer distance (0.605 nm) between Fe-Se(Te) planes, indicative of modulation of the superconducting order parameter along the c-axis. An inverse correlation between the power law exponent N of the electric field-current density (E-J) curve and the critical current density, Jc, has been observed at 4 K, when the orientation of H was close to the ab-plane. These results prove the presence of intrinsic pinning in Fe(Se,Te). A successful scaling of the angular dependent Jc and the corresponding exponent N can be realized by the anisotropic Ginzburg Landau approach with appropriate Γvalues 2~3.5. The temperature dependence of Γbehaves almost identically to that of the penetration depth anisotropy.

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References in corpus (20)

• New Fe-based superconductors: properties relevant for applications
• Tc=21K in epitaxial FeSe0.5Te0.5 thin films with biaxial compressive strain
• Multiband model for penetration depth in MgB2
• Significant enhancement of upper critical fields by doping and strain in Fe-based superconductors
• Anisotropic superconducting properties of single-crystalline FeSe0.5Te0.5
• Temperature dependent anisotropy of the penetration depth and coherence length in MgB$_2
• Systematic Comparison of Eight Substrates in the Growth of FeSe${}_{0.5}$Te${}_{0.5}$ Superconducting Thin Films
• Epitaxial growth of FeSe${}_{0.5}$Te${}_{0.5}$ thin films on CaF${}_2$ substrates with high critical current density
• Thermodynamic phase diagram of Fe(Se${}_{0.5}$Te${}_{0.5}$) single crystals up to 28 Tesla
• Scaling behaviour of the critical current in clean epitaxial Ba(Fe1-xCox)2As2 thin films
• High quality epitaxial FeSe0.5Te0.5 thin films grown on SrTiO3 substrates by pulsed laser deposition
• Critical current scaling and anisotropy in oxypnictide superconductors
• Coherent interfacial bonding on the FeAs tetrahedron in Fe/Ba(Fe(1-x)Co(x))2As2 bilayers
• Influenced of Fe buffer thickness on the crystalline quality and the transport properties of Fe/Ba(Fe1-xCox)2As2 bilayers
• Generic Fe buffer layers for Fe-based superconductors: Epitaxial FeSe1-xTex thin films
• Anisotropy of strong pinning in multi-band superconductors
• Angular dependence of resistivity in the superconducting state of NdFeAsO${}_{0.82}$F${}_{0.18}$ single crystals
• Penetration depth anisotropy in two-band superconductors
• Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs
• Jc Scaling and Anisotropies in Co-doped Ba-122 thin films

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